[meteorite-list] Photos of Czech tektite meeting in October 2013
Hi list I'm not so often on this list now, but I thought you might be interested in photos from the official opening of the Moldavite Museum in Cesky Krumlov, Southern Bohemia, Czech Republic on 19 October 2013. The museum is well worth a visit! See here: http://www.tektites.co.uk/muzeumvlatvinu.html Best Regards, Aubrey http://www.tektites.co.uk/ __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Meteor in UK
Meteor seen in UK See links: http://www.bbc.co.uk/news/uk-22460642 http://www.independent.co.uk/news/uk/home-news/video-large-green-fireball-meteor-seen-shooting-across-sky-above-england-and-wales-8608807.html __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] AD: BARWELL Meteorite for sale from original finder + documents - well worth a look
Hi List Presented is a very rare opportunity to obtain two exceptionally well preserved pieces of the historic British BARWELL meteorite (fell on Christmas Eve, 1965). What makes this even more special is that these pieces have been in the hands of the finder (a former Keeper of Geology at the Leicester Museum) for over 47 years! The pieces therefore come with a story and documentation. Well worth a look, even if not buying: http://www.tektiteshop.co.uk/ I have set up this webpage for a friend of a friend and you will be dealing directly with the lady who found the specimens. You can direct any enquires or offers directly to Jean Ferguson (ferguson814 'at' btinternet 'dot' com) - please don't reply to list or me. She is very open to serious offers, but will obviously wait a short while to consider her options. She is motivated to sell so please do not hesitate in putting in an offer as this valuable material is difficult to price - I'm pretty certain that another such offering is unlikely to appear any time soon! Regards, Aubrey Whymark on behalf of Jean Ferguson __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Publishing advice for Tektite book
Hi I am seeking advice on how to go about publishing a tektite book. The book is practically complete now (after a very long time). It’s 420 pages, 6x9 inch, black and white with numerous pictures and diagrams. I have a few issues in that I would like to maintain copyright. I want to avoid major reformatting and rewriting as I have limited time. I want to keep the price affordable (I’m not in it for the money and I don’t want Elsevier charging $30 a page). I don’t have time to sell it myself. I want to avoid ebooks - hardback books are so much nicer, but may consider putting it online at a later date. I want to get the book out a.s.a.p. as I think there is some interesting material within, plus I have other projects to move on to. It's certainly a step up from the website, which I haven't updated for a while - more to come soon I hope though. I don’t have any significant money constraints so I may just self publish and print say 500 copies. I could do this either in the Philippines, UK or US. Philippines is probably easiest for me, but then the problem of distribution. I know about 3 people who’d buy a copy in Manila and I’ll probably give them a free copy! Possibly if I get cheaper printing in Manila it may offset postal charges. US has some great publishing sites, but I don’t live there, then again lots of meteorite collectors do! I’m sure some of you guys have experience and maybe can point me in a sensible direction here. My email address is aub...@tektites.co.uk I'll apologise in advance if I don't get back to you straight away as I'll be travelling in the next few days. Regards, Aubrey http://www.tektites.co.uk/ __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Darryl Futrell (+) (also, question about Futrell Collection)
Hi This is the Museum most of Darryl's tektites went to http://www.lpi.usra.edu/meetings/metsoc2010/pdf/5366.pdf via The Tektite Source. A few pieces went to the Corning Museum of Glass (including the largest splashform in the world at the time - now 3rd largest). You can find these online. Some were sold via the meteorite exchange. Labels here: http://www.tektites.co.uk/tektite-labels.html Regards, Aubrey - Original Message - From: Michael Blood mlbl...@cox.net To: Phil Morgan roxfromsp...@gmail.com; Met. Michael Gilmer meteoritem...@gmail.com Cc: Meteorite List meteorite-list@meteoritecentral.com Sent: Tuesday, 14 August 2012, 14:43 Subject: Re: [meteorite-list] Darryl Futrell (+) (also, question about Futrell Collection) Hi Phil, Michael all, Paul may want to correct me, but I believe he and Jim purchased Darryl's entire collection in the later part of the 1990s, which served to launch the formation of THE METEORITE EXCHANGE. Paul and Jim Were very generous in their sales of Darryl's tektites, as they have always Been in every business interaction as long as I have known them. I doubt You could find a single person with whom they have done business that Would not say the same thing. These are the people who offer free advertizing meteorite classified ads to everyone and who publish METEORITE TIMES - again, free of charge. Darryl was at most of their Tektite Parties and I am fortunate to have a couple of nice photos from what was likely the last one he attended In the year 2000. (Note also the quality of digital photography twelve years ago) http://michaelbloodmeteorites.com/DarrylFutrell.html Thanks to Paul and Jim for such great memories on top of everything Else they have given. Hope you all enjoy the photos, Michael On 8/13/12 1:48 PM, Phil Morgan roxfromsp...@gmail.com wrote: Mike, I believe his collection went to a museum but Norm (tektitesource) doesn't name it on his site. see here: http://www.tektitesource.com/Futrell%20Collection.html for details. Jim and Paul (http://www.meteorites-for-sale.com/) have had some Futrell pieces in the past but haven't checked lately. Darryl was certainly a passionate and interesting man. I was never able to meet him but corresponded with him a bit and he was kind enough to send me a corrected copy of his Rock Gem articles with lots of hand-written notes and additional photos. Regards, Phil On Mon, Aug 13, 2012 at 2:07 PM, MikeG meteoritem...@gmail.com wrote: Hi Gang, I echo the sentiments in the original post. I never met the man, but I have heard much about him. I am curious. What happened to his collection after his passing? And, did he ever paint labels onto his specimens? I am selling a collection for a friend, and it has some superb-quality tektites in it. Some of the tektites have painted labels on them, and we cannot identify the label. It would be great if these were Futrell specimens, but that is probably just wishful thinking. Lastly, does anyone have a link to a hi-res photo of his famous tektite lamp? I have a low-res version, but I love to see something hi-res that really shows the detail. Best regards, MikeG -- - Web - http://www.galactic-stone.com/ Facebook - http://www.facebook.com/galacticstone Twitter - http://twitter.com/GalacticStone RSS - http://www.galactic-stone.com/rss/126516 - On 8/13/12, Daniel rainte...@aol.com wrote: I wish I could have met him! Daniel S. Sent from my iPhone On Aug 13, 2012, at 2:34 PM, Bernd V. Pauli bernd.pa...@paulinet.de wrote: Gone but still not forgotten! Bernd __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list
Re: [meteorite-list] Steves unproven tektite theory by Steve lol!
Are you sure these are flow lines? U-grooves are most definitely etched. These might be internal flow, varying slightly in chemistry, that have been etched. I have never seen flow lines on any tektite other than australites and javaites i.e. ablated forms. Aubrey - Original Message - From: Steve Dunklee steve.dunk...@yahoo.com To: Aubrey Whymark tinbi...@yahoo.co.uk Cc: Sent: Tuesday, 28 February 2012, 4:33 Subject: Re: [meteorite-list] Steves unproven tektite theory by Steve lol! Flow lines on a teardrop covering u grooves made during flight cheers Steve o.co.uk wrote: From: Aubrey Whymark tinbi...@yahoo.co.uk Subject: Re: [meteorite-list] Steves unproven tektite theory by Steve lol! To: Meteorite list meteorite-list@meteoritecentral.com Date: Monday, February 27, 2012, 4:35 AM Hi John and list I only check this list every week or so! I'm real busy with work and also writing my tektite book. It is very well progressed now - so hopefully soon, but the longer it takes the better it gets (I hope)! I said 2011, now 2012 (end of)! I have some very interesting new interpretations coming forward regarding the role of plastic deformation in almost ALL tektites. Check out my abstract for the LPI conference. http://www.lpi.usra.edu/meetings/lpsc2012/pdf/1045.pdf Regards, Aubrey - Original Message - From: John.L.Cabassi j...@cabassi.net To: 'Aubrey Whymark' tinbi...@yahoo.co.uk Cc: Sent: Monday, 27 February 2012, 5:25 Subject: RE: [meteorite-list] Steves unproven tektite theory by Steve lol! G'Day Aubrey Thank you. I've been watching this thread develop. I wanted to jump in but I wanted to see what further information people were willing to offer up. And I said to Kat, it's amazing that Aubrey hasn't jumped in and I just got home and logged in and sure enough, you're up close and personal. Cheers, John John Cabassi - Johnno IMCA #2125 www.MeteoriteJunction.com MeteoriteHQ.Com (still under construction) Twitter: @meteoritejohnno http://facebook.com/MeteoriteJohnno -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of Aubrey Whymark Sent: Sunday, February 26, 2012 6:21 PM To: Meteorite list Subject: Re: [meteorite-list] Steves unproven tektite theory by Steve lol! Hi The etching is genuine. The statement that 'if etching was terrestrial then the whole surface would be etched' is incorrect.You have to remember that different surfaces have been exposed to different conditions. Some surfaces simply have no stresses and lines of weakness for chemical attack to occur and if it does occur then it is more even on these surfaces. The posterior smooth surface, which was not exposed to re-entry heating, generally survives very well. The spalled areas or bald areas again have no lines of weakness and often avoid etching. The anterior surface which suffered re-entry heating and then rapid cooling has many lines of weakness and is readily attacked. If you take the stretch tektites then the exterior surface was cooled, re-heated and then rapidily cooled. The interior stretch part was exposed late on - either due to impact breakage or more likely thermal breakage when the tektite had lost its inherited cosmic velocity and shock wave and then rapidly cooled. This exposed stretch surface simply cooled. The two surfaces are very different in terms of thermal history and weaknesses, hence one is heavily etched and the other lightly or not etched. If you don't believe that pitting can form by natural etching then study ancient soda glass. Islamic glass jeton is great as it can be accurately dated. This material, sometimes over 1000 years old will sometimes show pitting. Soda glass is a lot lower in quality compared with tektite glass and so the process of etching is quicker. Etching is genuine, but is not random - this is the key point. It attacks cracks and weaknesses caused as the tektite cooled then re-entered the atmosphere. If you want to study etching then start with moldavites and then work towards the more recent Australasian tektites. Etching is a tricky subject btw. Etching is, strictly speaking, alkaline attack that targets the silica network. This usually creates v-grooves. Leaching is the acid attack which is more common as tektites usually occur reworked in porous and permeable gravels exposed to meteoric waters. Acid attack targets the alkaline component in the glass. The acid attack usually results in rounded pitting and u-grooves. The two processes can also act in parallel if conditions are right. The geological and reworking history of an individual specimen is often complex and, combined with abrasion from transportation, can result in a diversity of sculpture and morphologies. I know that etching is genuine, but I still wondered
Re: [meteorite-list] Steves unproven tektite theory by Steve lol!
Hi The etching is genuine. The statement that 'if etching was terrestrial then the whole surface would be etched' is incorrect.You have to remember that different surfaces have been exposed to different conditions. Some surfaces simply have no stresses and lines of weakness for chemical attack to occur and if it does occur then it is more even on these surfaces. The posterior smooth surface, which was not exposed to re-entry heating, generally survives very well. The spalled areas or bald areas again have no lines of weakness and often avoid etching. The anterior surface which suffered re-entry heating and then rapid cooling has many lines of weakness and is readily attacked. If you take the stretch tektites then the exterior surface was cooled, re-heated and then rapidily cooled. The interior stretch part was exposed late on - either due to impact breakage or more likely thermal breakage when the tektite had lost its inherited cosmic velocity and shock wave and then rapidly cooled. This exposed stretch surface simply cooled. The two surfaces are very different in terms of thermal history and weaknesses, hence one is heavily etched and the other lightly or not etched. If you don't believe that pitting can form by natural etching then study ancient soda glass. Islamic glass jeton is great as it can be accurately dated. This material, sometimes over 1000 years old will sometimes show pitting. Soda glass is a lot lower in quality compared with tektite glass and so the process of etching is quicker. Etching is genuine, but is not random - this is the key point. It attacks cracks and weaknesses caused as the tektite cooled then re-entered the atmosphere. If you want to study etching then start with moldavites and then work towards the more recent Australasian tektites. Etching is a tricky subject btw. Etching is, strictly speaking, alkaline attack that targets the silica network. This usually creates v-grooves. Leaching is the acid attack which is more common as tektites usually occur reworked in porous and permeable gravels exposed to meteoric waters. Acid attack targets the alkaline component in the glass. The acid attack usually results in rounded pitting and u-grooves. The two processes can also act in parallel if conditions are right. The geological and reworking history of an individual specimen is often complex and, combined with abrasion from transportation, can result in a diversity of sculpture and morphologies. I know that etching is genuine, but I still wondered if some of the anterior sculpture on indochinites was original. I don't think it is. Another way to study etching is to collect half a ton of different tektites with various stages of sculpture. Your wife will be happy with that suggestion. Also, tektites are glass, quenched very quickly - no crystals or crystallites here! Regards, Aubrey Whymark From: Daniel rainte...@aol.com To: meteorite-list@meteoritecentral.com Sent: Saturday, 25 February 2012, 19:26 Subject: Re: [meteorite-list] Steves unproven tektite theory by Steve lol! Hi Carl, I don't agree with everything about this theory, I just thought it was interesting. There all still a lot of unknowns when it comes to tektites. Are you a tektite collector? Best Regards, Daniel Sutherland On Feb 25, 2012, at 9:45 AM, cdtuc...@cox.net wrote: Daniel, Steve, All due respect to this theory. I'd like to hear more about this theory because he says; Theories about chemical etching and spalling as the major creators of surface sculpturing have been proven unlikely. He does not explain this statement. How has this been proven unlikely? If his theory is true. How do you explain all of the glass rocks found that have the same surface features as tektites but, have been ruled out as tektites based largely on the amount of H2O within them? Arizonaites( Saffordites) ?, Columbianites?, etc. Carl meteoritemax -- Cheers Daniel rainte...@aol.com wrote: Hi all, Take a look at this website. http://www.edamgaard.dk/Copy%20of%20VietnamTektites%20edj.htm Cheers, Daniel Sutherland Sent from my iPhone On Feb 24, 2012, at 11:19 PM, Dan Wray daniel_w...@comcast.net wrote: Steve, I am a tektite collector and I agree with you about the so called etching. If you look at broken fragments of hollow tektites the inside surface is smooth and the outside textured. You can also see this on stretched specimens, the stretched area is smooth. This so called etching is bogus. Dan Wray - Original Message - From: Steve Dunklee steve.dunk...@yahoo.com To: Meteorite-list@meteoritecentral.com Sent: Friday, February 24, 2012 1:41 PM Subject: [meteorite-list] Steves unproven tektite theory by Steve lol! I believe the features on most tektites are produced during formation and not by etching. As the molten material reaches the upper atmosphere they reach a verry cold environment with low
Re: [meteorite-list] Bediasites agree with Steve's unproven tektite theory
Hi I like your last paragraph Brian - I think this is closer to the truth. Tektite glass doesn't survive 35 million years unless it is in rather special preservational conditions. The U-grooved specimens likely sat around for a few hundreds of thousands of years in an acidic (rainwater) environment which etched them. Had they remained in this environment they would be gone by now. Instead they were incorporated into a sediment that, for whatever reason, preserved them. I'm not familiar with the Manning Fm and Jackson Fm. Low permeability would preserve specimens. Also if there was only acid leaching then the alkaline ions are removed and then the remaining silica acts as a barrier and the process stops (Adams, 1984). Similarly if there is only alkaline attack in a closed environment then waters become saturated in silica and the etching essentiallys stops. One wonders whether the rock was saturated in silica, suppressing the leaching rate to zero? As Brian mentioned it's also noteworthy that some bediasites also show pyramidal v-grooving, which is caused by alkaline etching attacking the silica network. Some show the classic u-grooving like the philippinites. The u-grooving and navels are chemically enhanced cracks formed when the tektite cooled rapidly and spalled in the latter stages of re-entry. I have philippinites that show paper-thin cracks, narrow u-grooves and thick u-grooves - every stage. Regards, Aubrey Whymark www.tektites.co.uk - Original Message - From: Steve Dunklee steve.dunk...@yahoo.com To: meteorite-list@meteoritecentral.com; brian burrer brim...@gmail.com Cc: Sent: Saturday, 25 February 2012, 2:04 Subject: Re: [meteorite-list] Bediasites agree with Steve's unproven tektite theory Imagine? outgasing causes a spike to form on the surface of a tektite as it cools 5 miles up. then as it falls the spike breaks off to form a ring at its base. half ring or u groove ect. cheers Steve --- On Fri, 2/24/12, brian burrer brim...@gmail.com wrote: From: brian burrer brim...@gmail.com Subject: [meteorite-list] Bediasites agree with Steve's unproven tektite theory To: meteorite-list@meteoritecentral.com Date: Friday, February 24, 2012, 9:49 PM Hi list, Bediasites are well known for, among other things, these two traits: 1.Most Bediasites show ample evidence of abrasive transport and minor to severe smoothing of the surface. 2.Bediasites are found in/on the basal portion of the Manning unit of the Jackson formation in Texas. They are almost never encountered off formation. The age of volcanic ash later/higher in the Manning is about one million years after Bediasite formation so the tektites were placed there rather soon after the event. The age of deposition of the Bediasites in the Manning would be about thirty five million years ago. Despite the passing of an immense amount of time etching has failed to significantly alter the surfaces of the tektites. U-grooves, V-grooves and navels all exist on stones with different amounts of ancient abrasion only slightly muting some and almost obliterating others. If they were in an environment conducive to etching after burial Bediasites should all be similar to the Besednice hedgehog Moldavites. The evidence suggests that little etching has occurred on most Bediasites after transport. These things taken together suggest that surface sculpture on Bediasites was a pre-existing condtion and was not developed by later etching. There is one small problem with this; the tektites did get some amount of time (less than one million years) to etch prior to their addition to the basal Manning sediments. While it is possible they were heavily etched in their earliest years and then abrasively transported, it is certain they did not etch significantly once buried. Happy hunting, Brian __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Steves unproven tektite theory by Steve lol!
Hi John and list I only check this list every week or so! I'm real busy with work and also writing my tektite book. It is very well progressed now - so hopefully soon, but the longer it takes the better it gets (I hope)! I said 2011, now 2012 (end of)! I have some very interesting new interpretations coming forward regarding the role of plastic deformation in almost ALL tektites. Check out my abstract for the LPI conference. http://www.lpi.usra.edu/meetings/lpsc2012/pdf/1045.pdf Regards, Aubrey - Original Message - From: John.L.Cabassi j...@cabassi.net To: 'Aubrey Whymark' tinbi...@yahoo.co.uk Cc: Sent: Monday, 27 February 2012, 5:25 Subject: RE: [meteorite-list] Steves unproven tektite theory by Steve lol! G'Day Aubrey Thank you. I've been watching this thread develop. I wanted to jump in but I wanted to see what further information people were willing to offer up. And I said to Kat, it's amazing that Aubrey hasn't jumped in and I just got home and logged in and sure enough, you're up close and personal. Cheers, John John Cabassi - Johnno IMCA #2125 www.MeteoriteJunction.com MeteoriteHQ.Com (still under construction) Twitter: @meteoritejohnno http://facebook.com/MeteoriteJohnno -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of Aubrey Whymark Sent: Sunday, February 26, 2012 6:21 PM To: Meteorite list Subject: Re: [meteorite-list] Steves unproven tektite theory by Steve lol! Hi The etching is genuine. The statement that 'if etching was terrestrial then the whole surface would be etched' is incorrect.You have to remember that different surfaces have been exposed to different conditions. Some surfaces simply have no stresses and lines of weakness for chemical attack to occur and if it does occur then it is more even on these surfaces. The posterior smooth surface, which was not exposed to re-entry heating, generally survives very well. The spalled areas or bald areas again have no lines of weakness and often avoid etching. The anterior surface which suffered re-entry heating and then rapid cooling has many lines of weakness and is readily attacked. If you take the stretch tektites then the exterior surface was cooled, re-heated and then rapidily cooled. The interior stretch part was exposed late on - either due to impact breakage or more likely thermal breakage when the tektite had lost its inherited cosmic velocity and shock wave and then rapidly cooled. This exposed stretch surface simply cooled. The two surfaces are very different in terms of thermal history and weaknesses, hence one is heavily etched and the other lightly or not etched. If you don't believe that pitting can form by natural etching then study ancient soda glass. Islamic glass jeton is great as it can be accurately dated. This material, sometimes over 1000 years old will sometimes show pitting. Soda glass is a lot lower in quality compared with tektite glass and so the process of etching is quicker. Etching is genuine, but is not random - this is the key point. It attacks cracks and weaknesses caused as the tektite cooled then re-entered the atmosphere. If you want to study etching then start with moldavites and then work towards the more recent Australasian tektites. Etching is a tricky subject btw. Etching is, strictly speaking, alkaline attack that targets the silica network. This usually creates v-grooves. Leaching is the acid attack which is more common as tektites usually occur reworked in porous and permeable gravels exposed to meteoric waters. Acid attack targets the alkaline component in the glass. The acid attack usually results in rounded pitting and u-grooves. The two processes can also act in parallel if conditions are right. The geological and reworking history of an individual specimen is often complex and, combined with abrasion from transportation, can result in a diversity of sculpture and morphologies. I know that etching is genuine, but I still wondered if some of the anterior sculpture on indochinites was original. I don't think it is. Another way to study etching is to collect half a ton of different tektites with various stages of sculpture. Your wife will be happy with that suggestion. Also, tektites are glass, quenched very quickly - no crystals or crystallites here! Regards, Aubrey Whymark From: Daniel rainte...@aol.com To: meteorite-list@meteoritecentral.com Sent: Saturday, 25 February 2012, 19:26 Subject: Re: [meteorite-list] Steves unproven tektite theory by Steve lol! Hi Carl, I don't agree with everything about this theory, I just thought it was interesting. There all still a lot of unknowns when it comes to tektites. Are you a tektite collector? Best Regards, Daniel Sutherland On Feb 25, 2012, at 9:45 AM, cdtuc...@cox.net wrote: Daniel, Steve, All due respect to this theory. I'd like to hear more about this theory because he says; Theories about
[meteorite-list] Darryl Futrell the Beyer 'Monster' Philippinite
Hi List I am trying to trace the history of the Beyer 'Monster' philippinite (1,070g). I know that some of you knew Darryl and therefore may have discussed this with him. Does anyone on the list know how Darryl acquired this specimen (it originally belonged to Beyer)? Did anyone else own it inbetween? Also what were the circumstances of the donation of this specimen to the Corning Museum of Glass? I believe the donation was made in year 2000. Does anyone have 'the animal' - I assume this was acquired at the same time. Thanks, Aubrey www.tektites.co.uk __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] New type of fake moldavite coming soon?
Hi I have to say that is a nice looking fake moldavite and as a piece of artwork I want one! I can see how one could be fooled by it though and it is dangerous. Simply the size and very flat shape with square edges give it away as being a fake though. One can see that if this fake was refined it could become tricky to distinguish fakes from the genuine article. I have a fakes page at http://www.tektites.co.uk/fake-frauds.html, but not updated for a while. Also check out Milan's known fake from China - This is a very similar piece and I bet this came from the same place - again too large and flat. See page http://www.tektites.co.uk/european-tektite-forum-2011.html and then go to the powerpoint presentation 'Milan Trnka's Collection Part 2 of 3' and look at slide 126. You'll also see what genuine large moldavites look like in this powerpoint presentation. I would be interested to find out how this was made. Looks like a piece of bottle glass that has been carved. The radiating pattern is not natural and therefore HF would not bring this out. I think before buying anything of value you have to know your subject area well and I always recommend buying from the source (or a known reliable dealer/collector). Regards, Aubrey www.tektites.co.uk From: veom...@gmail.com Date: Mon, 1 Aug 2011 12:15:01 -0500 To: meteorite-list@meteoritecentral.com Subject: [meteorite-list] New type of fake moldavite coming soon? My buddy Justin at The-Vug just put out a new article on Fakeminerals.com about a new type of fake moldavite that has been recently spotted in China: http://www.fakeminerals.com/?p=146 I'm not sure if this is the material people are already familiar with, or if it is indeed a new type, but it's impressive looking. - Yinan __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] AD: Special: Truly baffling sensational Howardite - NWA 6709 - absolutely stunning and very fresh.
Hi The rainbow colour looks like oil to me. Maybe someone has used oil or WD40 to clean it. I sometimes encounter 'rainbow' tektites and the guys want extra because of it - in reality it is due to oil contamination, probably from the mining operations. Regards, Aubrey www.tektites.co.uk --- On Thu, 21/7/11, Martin Altmann altm...@meteorite-martin.de wrote: From: Martin Altmann altm...@meteorite-martin.de Subject: Re: [meteorite-list] AD: Special: Truly baffling sensational Howardite - NWA 6709 - absolutely stunning and very fresh. To: meteorite-list@meteoritecentral.com Date: Thursday, 21 July, 2011, 0:33 Hi Mike, no worries, neither we understood it like that. Of course, if one looks to the photos, the first idea, which comes to one's mind is: oil. No idea, what causes this effect, maybe the composition. Also that strange tint the cut faces reveal. And especially worrying is the variety of the odd inclusions. I mean normally we all get already excited, whenever we find a carbonaceous fragment in a howardite, but what that stone has all for strange clasts - that is really not normal anymore. Since 1999 Stefan is in Morocco and since then we certainly had quite a bunch of materials in our hands, but such a weird polymict one - extremely unusual. And it seems that many collectors feel the same, if after such a short time now only three slices are left. Now all of the smaller ones are gone, sorry for that. But we have still a slice left, which we could subdivide into small partslices, if desired - but for that one has really to raise his finger. For the moment! Martin -Ursprüngliche Nachricht- Von: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] Im Auftrag von Galactic Stone Ironworks Gesendet: Donnerstag, 21. Juli 2011 00:48 An: Chladnis Heirs Cc: meteorite-list@meteoritecentral.com Betreff: Re: [meteorite-list] AD: Special: Truly baffling sensational Howardite - NWA 6709 - absolutely stunning and very fresh. Hi Martin, I didn't mean to impeach the meteorite, I was just curious. This is indeed a mystery. Have any scientists offered or agreed to look at it? Perhaps hit the rainbow area with the microprobe or SEM? Aesthetically speaking, it's gorgeous and looks like Mother of Pearl. :) Best regards, MikeG -- - Galactic Stone Ironworks - Meteorites Amber (Michael Gilmer) Website - http://www.galactic-stone.com Facebook - http://tinyurl.com/42h79my News Feed - http://www.galactic-stone.com/rss/126516 Twitter - http://twitter.com/galacticstone EOM - http://www.encyclopedia-of-meteorites.com/collection.aspx?id=1564 - On 7/20/11, Chladnis Heirs n...@chladnis-heirs.com wrote: No, it's natural! Martin -Ursprüngliche Nachricht- Von: Galactic Stone Ironworks [mailto:meteoritem...@gmail.com] Gesendet: Mittwoch, 20. Juli 2011 23:24 An: Chladnis Heirs Cc: meteorite-list@meteoritecentral.com Betreff: Re: [meteorite-list] AD: Special: Truly baffling sensational Howardite - NWA 6709 - absolutely stunning and very fresh. Wow! That is one of the most beautiful howardites I have ever seen. Nice find. :) The rainbox coloration is very odd. Was the stone cleaned at any time? Best regards, MikeG - Galactic Stone Ironworks - Meteorites Amber (Michael Gilmer) Website - http://www.galactic-stone.com Facebook - http://tinyurl.com/42h79my News Feed - http://www.galactic-stone.com/rss/126516 Twitter - http://twitter.com/galacticstone EOM - http://www.encyclopedia-of-meteorites.com/collection.aspx?id=1564 - On 7/20/11, Chladnis Heirs n...@chladnis-heirs.com wrote: Dear meteorite community, with this Special we have to introduce to you an enormous oddity. It is about a HED-meteorite of a kind, which we hadn't ever seen before in our careers before. It came in two stones, one of them was covered with a lush fusion crust, wonderfully structured by thick and oriented flowlines. And in some parts, that very crust displayed a gloss and a shine, iridescent in all colours of the rainbow; an effect, reminding almost to bismuth! Please take a look to the photos, where we tried to captured the effect: http://www.chladnis-heirs.com/new-meteorites/nwa6709.html The interior was no less a riddle for us. The distribution and sizes of the various fragments and clasts were unlike we had seen in any polymict HED before. A variety of clasts is of a kind, like we never had recovered in any Vesta meteorite. Please
[meteorite-list] Very Large (Philippine) Tektites
Hi I am compiling a list of the largest Philippine tektites. If you have a large (over 900g) Philippinite then please let me know. Also please let me know the details (dates, localities, story, history) and indicate if I can publish the data. Also interested in data on particularly large tektites from anywhere else in the world for the website! This is my list so far: Weight Locality Find DateCurrent Owner 1,195.00g‡ Talusan, Paracale, Bicol 05 Feb 2011 Aubrey Whymark, Philippines 1,070.54g Bicol Before Apr 1937 Corning Museum of Glass, N.Y., USA Under 1,020g* Coco Grove, Paracale, Bicol Aug-Dec 1938 Not known 1,018.40g* Paracale, Bicol Old Collection Aubrey Whymark, Philippines 1,009g Paracale, BicolUnknown Dieter Heinlein, Germany 991.7gAssume BicolPre-2007Formerly Futrell, ?Lehman, USA 986gAssume BicolPre-2007Prof. Zelimir Gabelica (in 2007) 970.2g†Assume BicolPre-2011Milan Trnka, Czech Republic 967g†Assume BicolPre-2007Prof. Zelimir Gabelica (in 2007) 966.85gAgusan, Bicol18 Jun 2011Aubrey Whymark, Philippines 924.9gBicolPre-2008Guido von Berg, Spain/Germany ABOVE: A table of known Philippinites over 900g in weight. Almost certainly more exist. ‡ Not yet formally weighed. * Strong chance that these are the same specimen but not provable. † Probably the same specimen. Also please see my webpage at http://www.tektites.co.uk/largest_tektites.html Thanks in advance, Aubrey Whymark aub...@tektites.co.uk www.tektites.co.uk __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Named minor planets
12753 Povenmire (1993 HE) is a main-belt asteroid discovered on April 18, 1993 by C. S. Shoemaker and E. M. Shoemaker at Palomar Observatory (after Hal Povenmire) --- On Wed, 29/6/11, lebof...@lpl.arizona.edu lebof...@lpl.arizona.edu wrote: From: lebof...@lpl.arizona.edu lebof...@lpl.arizona.edu Subject: Re: [meteorite-list] Named minor planets To: Dieter Heinlein dieter-heinl...@t-online.de Cc: Meteorite List meteorite-list@meteoritecentral.com Date: Wednesday, 29 June, 2011, 15:40 I am aware of two pairings where a husband and wife both have asteroids named in their honor. In one case, the wife is on the list but the other is in astronomy (Richard should have known this): 118945 Rikhill 164215 Doloreshill and in the other case, the husband and the wife both have asteroids but due to their science education (the husband is on the list): 3439 Lebofsky 5052 Nancyruth Larry There's another asteroid, that should be added to the list: (6371) Heinlein (after Dieter Heinlein) Best regards Dieter German Firebal Network www.dlr.de/feuerkugelnetz - Original Message - From: Marco Langbroek marco.langbr...@wanadoo.nl To: Meteorite List meteorite-list@meteoritecentral.com Sent: Wednesday, June 29, 2011 11:08 AM Subject: Re: [meteorite-list] Named minor planets Any idea how many and who? Chris Spratt To make a small start: (163800) Richardnorton (after O. Richard Norton (deceased)) (73491) Robmatson (after Rob Matson) (7392) Kowalski (after Richard Kowalski) (2925) Beatty (after Kelly Beatty) (6524) Baalke (after Ron Baalke) (4789) Sprattia (after Chris Spratt) (183294) Langbroek (after me = Marco Langbroek) But there must be more. - Marco Dr Marco (183294) Langbroek http://www.marcolangbroek.nl http://asteroids.marcolangbroek.nl - __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] European Tektite Forum 2011 Updated Photos
Hi As promised I have updated and annotated the photos from the European tektite forum. You can view or download. The photo slide shows include: Moldavite Field Trip Milan Trnka's amazing collection Czech National Museum tektites Czech National Museum meteorites all at http://www.tektites.co.uk/european-tektite-forum-2011.html Regards, Aubrey Whymark www.tektites.co.uk __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] European Tektite Forum 2011 - Moldavite find rate
Hi Re: Find rate of Moldavites Well we were taken to the best spot! Milan has GPS coordinates of probably thousands of finds all plotted on Google Earth. An amazing database. Searching on the field I personally found 2 smallish specimens in maybe a couple of hours. Others found more. I guess maybe 30 mins per small Moldavite (1 hr for me). We went to another Moldavite location though and we all came up with nothing despite the gravels being evident in the soil and other collectors being around. With regards the illegal mining operation the chap had been digging a few hours and I think he said he had found nothing. The previous day he had a matchbox full of say 10 smallish pieces. Then again a weeks work of another guy revealed a bag that maybe weighed a kilo I am guessing from another locality. It was very much luck of the draw - some days were bad, other days you would find a specimen worth hundreds or maybe, if very lucky, worth thousands of dollars. The big difference between mining and picking from the field was that the unchipped large fragments are found by mining - chipped smaller pieces are found on the field. One thing I can say - it takes a lot of effort to find even bad Moldavites and I will never again complain at paying a few hundred dollars for a Moldavite - it's cheap compared with the work put in! Regards, Aubrey --- On Mon, 25/4/11, Meteorite Mania! meteoritema...@gmail.com wrote: From: Meteorite Mania! meteoritema...@gmail.com Subject: Re: [meteorite-list] European Tektite Forum 2011 Photos To: Aubrey Whymark tinbi...@yahoo.co.uk, meteorite-list@meteoritecentral.com Date: Monday, 25 April, 2011, 19:52 Aubrey, Thanks for sharing the pictures, I look forward to the updates with captions. What is the average number of hours searching before one will find any moldavite? Thanks Milan for showing your treasures, what a fantastic collection; I would be willing to bet that is the finest moldavite and tektite collection in the world. Thanks for letting us get a glimpse. All the best, Ty Meteorite Mania On Sun, Apr 24, 2011 at 6:11 PM, Aubrey Whymark tinbi...@yahoo.co.uk wrote: Hi We had a great time at the European Tektite Forum 2011 in Brno, Czech Republic, hosted by Milan Trnka. I have uploaded a load of unedited photos onto my site at http://www.tektites.co.uk/european-tektite-forum-2011.html I hope to edit the photos and add annotations and descriptions in the next 2-3 months so do check back! Regards, Aubrey www.tektites.co.uk __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] European Tektite Forum 2011 Photos
Hi We had a great time at the European Tektite Forum 2011 in Brno, Czech Republic, hosted by Milan Trnka. I have uploaded a load of unedited photos onto my site at http://www.tektites.co.uk/european-tektite-forum-2011.html I hope to edit the photos and add annotations and descriptions in the next 2-3 months so do check back! Regards, Aubrey www.tektites.co.uk __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Very Interesting Photo- Tektite Related
Hi Interesting, but I don't think this supports any tektite formation theories. Tektites were either plastically deformed when proximal, spalled when medial or ablated and then often spalled when distal. Rain drops are, however, very informative about proximal tektites, which basically follow the same formation method with two big difference: Tektites cool and 'freeze' in transient morphologies and the tektite 'liquid' is of different viscosity (continually becoming more viscous as temperature drops). These transient tektite morphologies comprise discs and teardrops. Rain drops are spherical - when larger they become concavo-convex discs and then cascade into smaller spheres. If only the early tektite researchers had studied proximal tektites and not distal forms - their conclusions on the aerodynamics would have to be that tektites either formed on the Earth or that the moon has a significant atmosphere (or that tektites arrived from the moon in a huge molten blob which was disrupted during re-entry - but that's getting desperate). Ice cubes give an insight to tektite formation - they cool from the outside-in thus giving a radial pattern internally. Tektites also cool from the outside-in and have a radial internal structure with bubble complexes often trapped in the centre. Hail stones grow from the inside out and so have a concentric structure unlike tektites. These hailstones pictured are weird - they look like hailstones that have had icicles grow on them. They form in a totally different way to tektites, but interesting nonetheless. Tektites do not grow - they distort, spall (explosively fragment and lose mass) or ablate (lose mass by material melting and flowing from the specimen) during re-entry. Found an interesting paper on these lobed hailstones here: http://journals.ametsoc.org/doi/pdf/10.1175/1520-0469%281970%29027%3C0667%3ALSOH%3E2.0.CO%3B2 Regards, Aubrey www.tektites.co.uk --- On Thu, 24/3/11, Mike Groetz mpg4...@gmail.com wrote: From: Mike Groetz mpg4...@gmail.com Subject: [meteorite-list] Very Interesting Photo- Tektite Related To: Meteorite List meteorite-list@meteoritecentral.com Date: Thursday, 24 March, 2011, 12:17 List- Check out this ice hail photo. It really substantiates the theories behind tektite formation. http://www.coasttocoastam.com/photo/category/photo-of-the-day Have a good day. Mike __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Tektite Presentation
Hi For those interested in tektites, then you might be interested to view the powerpoint presentation of my recent lecture on tektites. Check out 'What's New?' on www.tektites.co.uk. http://www.tektites.co.uk/whats-new.html Regards, Aubrey Whymark __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Tektite Presentation
Hi Norm and list I started out thinking that Splashforms formed by contact with the ground, but this is not possible because of the bald spots. The bald spots, as you know, formed by spalling - so why just the anterior margin if the tektite splatted on the ground - bald spots should be all over. Secondly the shape of some of the tektites does not make sense. Take the Hershey's Kiss example. These should not exist as in longer teardrops the stable orientation is not vertical. In fact the only way these morphologies could form is if they formed within the atmosphere whilst the tektite still had inherited cosmic velocity and was still probably travelling up. Another point - large discs - the anterior depression, which I call a sump, is usually not central. This is consistent with atmospheric production. There is no doubt in my mind, whatsoever, that Indochinites formed within the atmosphere - some during the upward phase, some in the downwards journey. Indochinites never truely left the atmosphere. The 'vertibrae' tektites are real rare and might just be freaks (like really rarely we come across Philippinites that appear to have two anteriors. The blunt area on an asymmetrical dumbbell is caused by late stage spalling (same as a bald spot). I guess the 'vertibrea' may form in the same way - maybe one end spalls, this changes the balance of the specimen leading to the other end spalling. Interesting what you say about Australites and certainly worth more thought. I don't believe any wind tunnel experiment has, however, truely replicated tektite formation in terms of true velocity of 8-11 km/sec. Might be wrong - will read up again. You do need the ablation first though to explain why distal Australite cores are bulbous, whereas more proximal australites are often less bulbous and then Philippinites are typically shield-like. Clearly the ablation stage protects the tektite somewhat in carrying the heat away. Personally I am always interested why almost all Australites are oriented whereas Philippinites are most commonly oriented, but unoriented specimens are not uncommon. I guess it's simply due to distance travelled, with a much greater time for Australites to find a stable orientation. Back to Philippinites - most are spherical. Teardrops are very very very rare. When you find them though, they are very interesting. A few show subtle distortion suggestive of atmospheric deformation, presumably on the way up. I even have two 'stretch' Philippinites. Sure they are on the website somewhere - http://www.tektites.co.uk/stretch.html. These are not like the classic Indochinite stretchforms, but clearly show stretching where two parts of the tektite are more solid than another as evidenced by stretched vs round bubbles. This deformation, again must have occurred on the way-up. Come to the biggest Philippinites 10cm diameter +. These normally show some degree of spalling and are off-spherical, but take the primary surface and they were spherical bodies. Even the largest Philippinites entered with a solid exterior, exactly as one would expect from cooling experiments. So the vast majority of Philippinites probably formed in 'space' as oppose to within the 'atmosphere', but a few may have been distorted in the upper reaches of the atmosphere as they exited. Regards, Aubrey --- On Mon, 21/2/11, Norm Lehrman nlehr...@nvbell.net wrote: From: Norm Lehrman nlehr...@nvbell.net Subject: Re: [meteorite-list] Tektite Presentation To: Aubrey Whymark tinbi...@yahoo.co.uk Date: Monday, 21 February, 2011, 14:52 Aubrey, Good stuff! There are are a few things I will need to think about. You've offered some truly fresh ideas. For example, I've always assumed that the splatting of advanced splashforms was the result of impact with the ground, whereas you do it with air resistance. Could be right, but I'll need to sleep on it a bit. One observation that has me stumped may bear on the question: Hershey's Kisses and their shorter-remnant-tailed splatforms almost always show flow-banding that reflects a differential twist between the tail and the main body. This means that something retarded the spin of one part or the other. I have been thinking that a spinning body splatting onto the ground would be abruptly anchored while the tail carries on for another half-twist or so. Would friction with a compressed air cushion achieve the same? Maybe... Also, I have always struggled with the fact that the splatted basal surface never molds itself around a pebble or piece of vegetative matter. Not once in hundreds of thousands of specimens I have handled. I have a few that look like they formed over another tektite---but if so, we should occasionally find a couple welded together. Your version of splatting against compressed air solves that problem. On the other hand, I have lots of what I call vertibrae, dumbells
[meteorite-list] World record 1,250g tektite from Philippines??
Hi Still seeking the new owner of a possible world record breaking tektite which came to light on 07 February 2011 in Paracale, Philippines. Very keen to know the true weight as the weight given by dealers here can be highly misleading. Certainly in the 900g to 1,250g range though and the weight estimate could well be realistic. You can let me know anonymously if you like - off-list. For the record the heaviest Philippinite is 1,070.54g and the heaviest of all tektites (excluding Muong Nong-type layered impactites) is either 1,070.54g (as above) or possibly a 1,200g Indochinite (shape is right, but might be a rolled/water worn Muong Nong-type). Also, I will be giving a presentation on tektites at Rizal Technological University on Boni Avenue in Mandaluyong, Manila, Philippines. It will be in the new building - Astronomy Centre at 9am (yes, very early) on Saturday 19th February. All welcome I am told. Regards, Aubrey Whymark www.tektites.co.uk __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] World record 1, 250g tektite from Philippines??
Hi This size tektite is perfectly feasible from China, but it would have been a Muong Nong-type tektite, which I consider to be someway between tektites and impactites. It would not have been a true splashform. If we take only true splashforms, ignore the incompletely melted and homogenised layered Muong Nong-types, then the largest tektites occur some 1,750 km from the impact site. This is true of the Australasian impact and the Chesapeake impact. Why do the biggest tektites not occur closest to the impact? Well, the reasons are complex, but basically as you move closer to the impact site the energy levels decrease as the energy of impact is spread over a wider area. The melt sheet is not ejected into 'space' before being disrupted. So proximal tektites form at lower atmospheric levels - they interact with the atmosphere and cascade into smaller forms. The large blocks of semi-melted material comprising Muong Nong tektites form at even lower energy levels - insufficient to even fully melt them. Back to the medial distance Philippinites. The melt sheet just about reached space before being disrupted into tektite bodies. (Rare Philippinites show some plastic deformation during their exit). The viscosity was low (as Philippinites are mainly spherical), but not as low as Australites (which encourages further break-up). A large sphere remains as a sphere and will not interact with the atmosphere to form a disc that cascades into smaller spheres. Move from the Philippines to Australia and tektites become progressively smaller as expected. The temperature of the melt was higher and the viscosity even lower. Also distal tektites were ejected at a lower angle and although no plastic distortion is recorded (perhaps due to them being exceedingly hot and the low viscosity), some atmospheric interaction, due to the lower ejection angle may have resulted in an early cascading effect. So 1,750 km or thereabouts from the impact site is perfect for ejection angle, viscosity and exiting the atmosphere. Perhaps this is the magic 30 degrees whereas Australites were maybe ejected at c. 15-20 degrees?? Aubrey www.tektites.co.uk --- On Tue, 15/2/11, Yinan Wang veom...@gmail.com wrote: From: Yinan Wang veom...@gmail.com Subject: Re: [meteorite-list] World record 1, 250g tektite from Philippines?? To: meteorite list meteorite-list@meteoritecentral.com Date: Tuesday, 15 February, 2011, 17:05 Here's a big fish story for you all; About ten years ago I was visiting a mineral shop inside a park in china and they had a football (American football) shaped tektite slightly larger than a football. I was quite sure it was a tektite and not slag nor obsidian. Must've massed about 8-12 kilos. It was priced at the equivalent of $700 USD, but back then I didn't appreciate meteorites and tektites and thus I ignored it. Only recently did I realize the importance of it, oh well. -Yinan On Tue, Feb 15, 2011 at 7:28 AM, Aubrey Whymark tinbi...@yahoo.co.uk wrote: Hi Still seeking the new owner of a possible world record breaking tektite which came to light on 07 February 2011 in Paracale, Philippines. Very keen to know the true weight as the weight given by dealers here can be highly misleading. Certainly in the 900g to 1,250g range though and the weight estimate could well be realistic. You can let me know anonymously if you like - off-list. For the record the heaviest Philippinite is 1,070.54g and the heaviest of all tektites (excluding Muong Nong-type layered impactites) is either 1,070.54g (as above) or possibly a 1,200g Indochinite (shape is right, but might be a rolled/water worn Muong Nong-type). Also, I will be giving a presentation on tektites at Rizal Technological University on Boni Avenue in Mandaluyong, Manila, Philippines. It will be in the new building - Astronomy Centre at 9am (yes, very early) on Saturday 19th February. All welcome I am told. Regards, Aubrey Whymark www.tektites.co.uk __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] World record 1, 250g tektite from Philippines??
Forgot to mention What is the biggest feasible tektite? Well, 1 kilos should not exist as at that size the inequal cooling of the glass should fragment the specimen. We do see this in the Philippines - fragments of true monsters! Always fragments of very large spheres probably a couple of kilos in size or more! So, the largest possible tektite - Well we have around 1,070g, possibly slightly more. The largest will likely be a dumbbell - a double 1,070g sphere. So a dumbbell weighing 2 kilos or slightly more is a possibility. This will occur in the Philippines - chances of one being found is close to zero. You can count the 1 kilos on a hand and most Philippinites are spherical. Dumbbells are relatively rare. So maybe after we have found 100 or 1,000 1 kilo spheres perhaps we'll chance upon a monster dumbbell! Aubrey www.tektites.co.uk --- On Wed, 16/2/11, Aubrey Whymark tinbi...@yahoo.co.uk wrote: From: Aubrey Whymark tinbi...@yahoo.co.uk Subject: Re: [meteorite-list] World record 1, 250g tektite from Philippines?? To: meteorite list meteorite-list@meteoritecentral.com Date: Wednesday, 16 February, 2011, 3:42 Hi This size tektite is perfectly feasible from China, but it would have been a Muong Nong-type tektite, which I consider to be someway between tektites and impactites. It would not have been a true splashform. If we take only true splashforms, ignore the incompletely melted and homogenised layered Muong Nong-types, then the largest tektites occur some 1,750 km from the impact site. This is true of the Australasian impact and the Chesapeake impact. Why do the biggest tektites not occur closest to the impact? Well, the reasons are complex, but basically as you move closer to the impact site the energy levels decrease as the energy of impact is spread over a wider area. The melt sheet is not ejected into 'space' before being disrupted. So proximal tektites form at lower atmospheric levels - they interact with the atmosphere and cascade into smaller forms. The large blocks of semi-melted material comprising Muong Nong tektites form at even lower energy levels - insufficient to even fully melt them. Back to the medial distance Philippinites. The melt sheet just about reached space before being disrupted into tektite bodies. (Rare Philippinites show some plastic deformation during their exit). The viscosity was low (as Philippinites are mainly spherical), but not as low as Australites (which encourages further break-up). A large sphere remains as a sphere and will not interact with the atmosphere to form a disc that cascades into smaller spheres. Move from the Philippines to Australia and tektites become progressively smaller as expected. The temperature of the melt was higher and the viscosity even lower. Also distal tektites were ejected at a lower angle and although no plastic distortion is recorded (perhaps due to them being exceedingly hot and the low viscosity), some atmospheric interaction, due to the lower ejection angle may have resulted in an early cascading effect. So 1,750 km or thereabouts from the impact site is perfect for ejection angle, viscosity and exiting the atmosphere. Perhaps this is the magic 30 degrees whereas Australites were maybe ejected at c. 15-20 degrees?? Aubrey www.tektites.co.uk --- On Tue, 15/2/11, Yinan Wang veom...@gmail.com wrote: From: Yinan Wang veom...@gmail.com Subject: Re: [meteorite-list] World record 1, 250g tektite from Philippines?? To: meteorite list meteorite-list@meteoritecentral.com Date: Tuesday, 15 February, 2011, 17:05 Here's a big fish story for you all; About ten years ago I was visiting a mineral shop inside a park in china and they had a football (American football) shaped tektite slightly larger than a football. I was quite sure it was a tektite and not slag nor obsidian. Must've massed about 8-12 kilos. It was priced at the equivalent of $700 USD, but back then I didn't appreciate meteorites and tektites and thus I ignored it. Only recently did I realize the importance of it, oh well. -Yinan On Tue, Feb 15, 2011 at 7:28 AM, Aubrey Whymark tinbi...@yahoo.co.uk wrote: Hi Still seeking the new owner of a possible world record breaking tektite which came to light on 07 February 2011 in Paracale, Philippines. Very keen to know the true weight as the weight given by dealers here can be highly misleading. Certainly in the 900g to 1,250g range though and the weight estimate could well be realistic. You can let me know anonymously if you like - off-list. For the record the heaviest Philippinite is 1,070.54g and the heaviest of all tektites (excluding Muong Nong-type layered impactites) is either 1,070.54g (as above) or possibly a 1,200g Indochinite (shape is right, but might be a rolled/water worn Muong Nong-type). Also, I will be giving a presentation on tektites
[meteorite-list] Very Large Philippine Tektite
Hi A potentially record breaking tektite came to light on Monday 7th February from Paracale. If you are the person who bought this item from Red Balesa could you email me off-list. I am just after some measurement data as it would be a shame if this specimen is lost to science. Thanks, Aubrey Whymark www.tektites.co.uk __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Podcast on Impacts - Geol. Soc. London
Hi Follow the link for a podcast on Impacts. You'll also see links to other interesting meteorite-related topics. http://www.geolsoc.org.uk/podcast9 When German physicist Ernst Florens Chladni published a pamphlet in 1794 arguing that meteorites had their origins in outer space, the idea was received with widespread mockery by the scientific community. Now, meteorites are recognised as an important astronomical process. But it has taken geologists a long time to acknowledge their significance to the history of the Earth - particularly as uniformitarianism overtook catastrophism as the prevailing theory of geologic change. Sarah talks to the Natural History Museum's Kieren Howard about the significance of meteorites to Earth - not only their impact on Earth's surface, but the effect they have on people. And we discuss the most famous meteorite to strike Earth - the Chicxulub impact. Long held responsible for the extinction of the dinosaurs, the Chixculub impact has been the focus of debate amongst scientists almost from the moment of its discovery. Sarah talks to a group of scientists who have been involved in a project to lay the debate to rest, once and for all. Regards, Aubrey __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Newly discovered Kamil Crater, Egypt
See these articles below - http://www.telegraph.co.uk/science/science-news/8026237/Meteor-crater-found-on-Google-Earth-could-help-prepare-for-future-impacts.html http://www.dailymail.co.uk/sciencetech/article-1315568/Massive-meteor-crater-discovered-spotted-Google-Earth.html http://www.sciencemag.org/cgi/content/abstract/329/5993/804 Regards, Aubrey __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] FW: Rock identification??
Hi Mark Concrete would be my guess too. That being the case it should have a considerably lower specific gravity than a meteorite. I'm sure they won't mind if you dump it in water to test that! I recently had a guy see a new type of tektite fall from the sky. Amazingly it looked like a marble and even had yellow, red and blue frit on it. I had to tell the guy someone had probably thrown it at him Aubrey --- On Wed, 15/9/10, Mark Ford mark.f...@ssl.gb.com wrote: From: Mark Ford mark.f...@ssl.gb.com Subject: [meteorite-list] FW: Rock identification?? To: Meteorite-list@meteoritecentral.com Date: Wednesday, 15 September, 2010, 13:51 Hi, I was recently sent a rock, the accompanying story was that it landed near someone with high velocity and was warm/hot to the touch. (Normally this story rings alarm bells as meteorites are generally not known to be warm especially small ones), however upon looking at the rock, it appears to have chondrules (or chondrule like objects), but has no fusion crust. Its about 27mm x 19mm, and is very slightly attracted to a strong magnet, (enough for the rock to move when a magnet is put next to it. I can't explain what i'm seeing, these chondrule like features are near perfect spherules!, however I can't see any metal grains! Under mag there are numerous spherules, and other unidentifiable inclusions, the matrix is a grey to light beige colour. Anyone care to take a stab at what this is? Pics at : http://s911.photobucket.com/albums/ac315/meteoritemark/ (Click the pics for a bigger view) Mark CONFIDENTIALITY NOTICE: This email and any files transmitted with it are confidential. If you are not the intended recipient, please notify us. Email i...@ssl.gb.com. You should not copy or use this email or attachment(s) for any purpose nor disclose their contents to any other person. GENERAL STATEMENT: Southern Scientific Ltd's computer systems may be monitored and communications carried on them recorded, to secure the effective operation of the system and for other lawful purposes. Registered address Rectory Farm Rd, Sompting, Lancing, W Sussex BN15 0DP. Company No 1800317 __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Origin of Tektites
Mike Artemevia papers have a lot on ejection angles. They conclude a 30 degree angle is optimum - so agreed - too oblique may not be good (although I suspect the Australasian event was more oblique than 30 degrees). Regards, Aubrey --- On Sat, 11/9/10, Michael Fowler mqfow...@mac.com wrote: From: Michael Fowler mqfow...@mac.com Subject: Re: [meteorite-list] Origin of Tektites To: meteorite-list@meteoritecentral.com Cc: Michael Fowler mqfow...@mac.com Date: Saturday, 11 September, 2010, 16:27 Aubrey, Keep working on your book, I'm sure there is a lot of interest in the subject, especially for a source takes all the best research out there and puts it together in a interesting and unified narrative. Question: Oblique impacts and those impacting silica rich sedimentary rock favor tektite production. Tektites are melted and distally ejected terrestrial rock. I had not heard that Oblique impacts favor tektite production, in fact I thought that high velocity perpendicular impacts favored the vaporized ejecta plume reaching outside the earth's atmosphere. Could you elaborate on the evidence favoring oblique impacts, or provide a link to any research on the topic? Thanks, Mike Fowler Chicago Hi I'm not sure if I qualify as a tektite 'expert', but I have done a lot of private research. I am working on a book which is 2/3 complete - hopefully 2011, but I struggle to find the time with my work and new baby! I have an extensive reference list on my website www.tektites.co.uk. This includes links to many freely downloadable papers. I've not updated the site recently so some material is out of date. Also I am working on an even more extensive reference list right now. Since the 1970's there has been no doubt as to the origin of tektites. They are formed by an asteroid or comet impacting with the Earth. The tektites are formed in the very earliest stages of impact. Oblique impacts and those impacting silica rich sedimentary rock favor tektite production. Tektites are melted and distally ejected terrestrial rock. North American tektites (Bediasites and Georgiaites) come from the Chesapeake Crater. Moldavites come from the Ries crater, Germany Ivory Coast tektites come from Bosumtwi Crater in Ghana. Australasian tektites come from an undiscovered crater most likely in the Bay of Tonkin between Vietnam and China, perhaps closer to Vietnam. It will be discovered and there is no doubt in this. Hope this helps, Aubrey www.tektites.co.uk __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Origin of Tektites - Interesting Crater Idea (at bottom)
Hi Ted and list Repectfully, I disagree with Prof. Wasson. To create tektites you need an impact with the ground. An Aerial blast will not eject a tektite 8000km down wind. The 10Be idea is wrong. Yes, the 10Be collects in silicates in the soil, but this soil is then transported and re-deposited. 10Be has a 1.36Ma half life, so with a fast deposition rate (130m/Ma in the Bay of Tonkin) you can have a sediment column a few hundred metres deep rich in 10Be - it's not just in the soil. There is a good paper by Ma P Aggrey K Tonzola C et al 2004 on Beryllium-10. This seems to point to a single crater in the Bay of Tonkin. When an asteroid impacts, the first formed tektites are derived from the very uppermost layers of sediment. They are ejected at the highest velocity and lowest angle. In the Australasian strewnfield these are the distal Australites. As the impact event proceeds, progressively deeper sediment is excavated and ejected as tektitic melt. The deeper (older) sediment has lower abundances of 10Be and will go on to form increasingly proximal tektites as the ejection velocity decreases and ejection angle increases. The last formed ‘tektites’ are the Muong Nong-type impactites. Average 10Be contents of Muong Nong-type impactites are ~1/3 and ~1/2 those of Australian tektites and splash-form Indochinites, respectively (Aggrey et al., 1998). The abundance of 10Be can then be used to create a map of roughly equal con-centration levels, which increase with distance from the undiscovered crater. Ma et al. (2004) suggests the most probable source is a single crater in the Gulf of Tonkin at 107°E; 17°N. I personally would broadly agree, but place the crater closer to 106.5°E; 19°N. I work in the oil industry as a wellsite geologist, but in the Middle East -not in Vietnam. I agree that nothing has been found, but I think there could be a few reasons. 1) The Chinese/Vietnamese boundary is disputed. 2) Oil industry people are unlikely to be shouting about possible structures that have not been drilled (unless they never want to work again). (Chicxulub crater for example) 3) I don't know how much structural/magnetic/gravity anomoly data is available. It certainly doesn't appear to be available to the public. Within an oil company a large crater may not be recognised, may not be interpreted as a crater and may be a company secret. (Chicxulub for example - well drilled in 1951 and found andesite, gravity data gathered in 1960, recognised as a crater in 1978, kept as company secret until 1981) 4) Maybe a well has not been drilled in the correct place - directly over the crater. 5) If a well has been drilled close to the crater the tophole rocks (including impactites and breccias) may not have even been looked at. When I drill a well I usually start looking at the rock a couple of thousand feet down, sometimes 5,000 ft down plus. Surrounding deposits will be in the top hundred or few hundred feet - the oil industry geologist will definitely not get a sample this shallow (even if they could). Also, will a wellsite geologist recognise impact products? - probably not - they are not trained to. 6) The sedimentation rates are high in the Bay of Tonkin - 3000 metres in the last 23 million years in some places(Pow-foong Fan, 1981) - so that could be +/- 100m in the last 803k. I'm sure I read somewhere 200-300 m of Quarternary deposits, but can't remember the source. 7) The Bay of Tonkin is shallow water - mainly under 50m depth. In the recent glacial and inter-glacial periods sea level went up and down. The crater could have been exposed and eroded, submerged and buried, perhaps numerous times. The dual process of erosion and high sedimentation rates could easily hide a crater. I am concluding from my reading that there is one single large crater (43-50km size). It has to be in the Gulf of Tonkin - this is where the tektite distribution pattern fits best and where geochemical signatures point to. Hainan and NE Thailand are a mirror - the crater is in the middle of these two places. I am also keeping a eye on Premier Oil's block 104/109-5 in Vietnam. See http://www.premier-oil.com/render.aspx?siteID=1navIDs=19,310,313,334 If there is anywhere I would put a crater then it is in this block. Maybe they know about a structure that we don't know about??? Regards, Aubrey www.tektites.co.uk --- On Sat, 11/9/10, Ted Bunch tbe...@cableone.net wrote: From: Ted Bunch tbe...@cableone.net Subject: Re: [meteorite-list] Origin of Tektites To: Aubrey Whymark tinbi...@yahoo.co.uk Date: Saturday, 11 September, 2010, 15:53 Dear Aubrey - Very adventurous of you to attempt this project. I have one disagreement with your conclusions below. The area that surrounds Vietnam is a very extensive shallow continental shelf . From oil exploration data, there is no evidence of a gravity, magnetic, or structural anomaly. In addition, no crater-forming impactites, breccias, etc
Re: [meteorite-list] Tunkuska Tektites?
Yeah this is fraudlent. These are Indochinites. Aubrey www.tektites.co.uk --- On Sat, 11/9/10, Steve Dunklee steve.dunk...@yahoo.com wrote: From: Steve Dunklee steve.dunk...@yahoo.com Subject: Re: [meteorite-list] Tunkuska Tektites? To: mlbl...@cox.net, meteorite-list@meteoritecentral.com Date: Saturday, 11 September, 2010, 11:45 looks like small indo china tektite . Clear skys .Steve On Thu Sep 9th, 2010 11:25 PM EDT Michael Blood wrote: Posted this (Below) earlier but if it went out to Others, it did not make it back to me Has anyone heard of the claims related to tektites Associated with the the Tunguska event? See these offerings on eBay: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=180558454201ssPageName=A DME:B:SS:US:1123 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=180558453506ssPageName=A DME:B:SS:US:1123 Anyone know who lives in Clearwater, FLA? Michael __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Origin of Tektites
Hi I'm not sure if I qualify as a tektite 'expert', but I have done a lot of private research. I am working on a book which is 2/3 complete - hopefully 2011, but I struggle to find the time with my work and new baby! I have an extensive reference list on my website www.tektites.co.uk. This includes links to many freely downloadable papers. I've not updated the site recently so some material is out of date. Also I am working on an even more extensive reference list right now. Since the 1970's there has been no doubt as to the origin of tektites. They are formed by an asteroid or comet impacting with the Earth. The tektites are formed in the very earliest stages of impact. Oblique impacts and those impacting silica rich sedimentary rock favor tektite production. Tektites are melted and distally ejected terrestrial rock. North American tektites (Bediasites and Georgiaites) come from the Chesapeake Crater. Moldavites come from the Ries crater, Germany Ivory Coast tektites come from Bosumtwi Crater in Ghana. Australasian tektites come from an undiscovered crater most likely in the Bay of Tonkin between Vietnam and China, perhaps closer to Vietnam. It will be discovered and there is no doubt in this. Hope this helps, Aubrey www.tektites.co.uk --- On Sat, 11/9/10, Steve Dunklee steve.dunk...@yahoo.com wrote: From: Steve Dunklee steve.dunk...@yahoo.com Subject: Re: [meteorite-list] Origin of Tektites To: epmaj...@shaw.ca, meteorite-list@meteoritecentral.com Cc: rasc...@lists.rasc.ca, mia...@uquebec.ca Date: Saturday, 11 September, 2010, 11:25 all i can say is there seems to be a great interest in tektites. Sterling?Can you stay sane enough to write the definitive book? Cheers Steve On Fri Sep 10th, 2010 1:06 AM EDT Ed Majden wrote: Are there any tektite experts on this list? The formation of tektites has been a mystery to science. Volcanic origin, Lunar ejecta, meteorite impact origin, explosive electrical discharge, etc. The latter proposed by NASA experiments at an arc-jet facility. What are the current theories on the formation of tektites. Are there any papers on this that I could get my hands on? Thanks: Ed Majden Courtenay, B.C. Canada __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] The Moon - One Titanic Tektite?
Mike and list An interesting thought, but the moon is not made of glass so it would have to be one giant impact spherule! Also it hasn't landed back on Earth yet! It can't be an -ite. It was pointed out to me that you have Meteorites and Meteors. But in the tektite world we only have Tektites, no Tekteors - just as well we haven't witnessed any genuine tektite falls (don't believe everything you read) or we wouldn't know what to call the falling body! Aubrey www.tektites.co.uk --- On Wed, 14/4/10, Galactic Stone Ironworks meteoritem...@gmail.com wrote: From: Galactic Stone Ironworks meteoritem...@gmail.com Subject: [meteorite-list] The Moon - One Titanic Tektite? To: Meteorite List meteorite-list@meteoritecentral.com Date: Wednesday, 14 April, 2010, 4:14 Hi Listees, I don't know if this thought has ever come up before in this way, but Isn't the moon, by definition, one gigantic tektite since it was spalled off from the Earth during a catastrophic meteorite impact? If so, then every lunar meteorite is also a tektite.of sorts. Best regards, MikeG -- Mike Gilmer - Galactic Stone Ironworks Meteorites http://www.galactic-stone.com http://www.facebook.com/galacticstone __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Tsunami alert (Report)
--- On Sat, 27/2/10, dean bessey deanbes...@yahoo.com wrote: Nothing to report from the Philippines either after staying away from the beach all day! Better to be safe than sorry though. From: dean bessey deanbes...@yahoo.com Subject: Re: [meteorite-list] Tsunami alert (Report) To:meteorite-list@meteoritecentral.com Date: Saturday, 27 February, 2010, 23:36 Well, hundreds of people here in Auckland camped out on a hill waiting for the tsunami. A dozen or so people refused to heed the warning and graciously stayed on the beach so that we could all have good video. A cruise ship was moved from the pier and anchored off in the harbour and all ferries in the city was canceled. Hundreds of yachts was out in what is a stunning beautiful summer day today. Unfortunately the tsunami was a bust and nobody on the beach got nominated for a darwin award. We got 2 or 3 minutes of heavy waves in an otherwise beautiful calm day with the water like glass. See here the photo of the extent of the tsunami in Auckland. The calm was broken for a couple minutes and the waves never even went up the beach. http://www.meteoriteshop.com/pictures/tsunami.jpg We did however have a really nice picnic in the park with my two kiddies. You can see the tsunami in the background in this photo behind my two kiddies who are sitting on a WW2 gun. http://www.meteoriteshop.com/pictures/tsunami2.jpg Cheers DEAN __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] worlds biggest tektite in history -Not
Hi The biggest Muong Nong-type tektites appear to be in the Laos-NE Thailand border and in Hainan. For sure they are very proximal tektites/impactites. I think the microtektite distribution pattern is a better indicator though as it's going to be statistically more reliable. All the evidence points to the Gulf of Tonkin, between Vietnam and Hainan - probably closer to Vietnam. This is a shallow sea (but might not have been sea at the time of impact, not that it would make a lot of difference). A crater in the sea would explain why a 43km +/- crater has not yet been found. In reality I bet this crater has been found on oil field seismic which should criss-cross the whole of this area. Maybe it hasn't been recognised, maybe the 'structure' has been kept secret because of it's possible economic value or maybe it lies in disputed Vietnamese-Chinese waters. I'm pretty sure it's out there though! I do wonder if any trace of rims would show up on bathymetric maps, but there has been a very large sediment input into this area in the last 800,000 years and I would imagine it could easily bury the crater. Interestingly the largest splashforms are found 2000 km away in the Philippines, not proximally in Indochina as one might first expect. Maybe this is because the Philippinite melt sheet was disrupted higher in the atmosphere meaning that philippinites were not immediately acted upon by significant atmospheric forces. The Indochinites probably formed at lower atmospheric levels that might aid breaking up of the largest of bodies. I'm sure there are a number of factors at play though. Same applies to the Chesapeake impact - the largest splashform tektites are 2000 km away in Texas. Aubrey --- On Sun, 13/12/09, Paul H. oxytropidoce...@cox.net wrote: From: Paul H. oxytropidoce...@cox.net Subject: [meteorite-list] worlds biggest tektite in history To: meteorite-list@meteoritecentral.com meteorite-list@meteoritecentral.com Date: Sunday, 13 December, 2009, 17:38 Phil Morgan wrote: For any interested in this topic, Aubrey Whymark has a nice page on large tektites here http://www.tektites.co.uk/largest_tektites.html . Has anyone tried plotting the locations of the largest known tektites? It seems like, their distribution, especially of the Muong Nong-type tektites, would provide some clues about the type and location of the impact that created them. Best Regrads, Paul H. __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] worlds biggest tektite in history
Thanks for the link Phil! I need to update the site a little actually, but it still makes good reading! I was emailed about this tektite a couple of days before it was listed. I told him it was a Muong Nong, but he seems to want to compare it to splashforms. This is a good size Muong Nong-type, but nowhere near a world record breaker! Aubrey www.tektites.co.uk --- On Sat, 12/12/09, Phil Morgan roxfromsp...@gmail.com wrote: From: Phil Morgan roxfromsp...@gmail.com Subject: Re: [meteorite-list] worlds biggest tektite in history To: Jason Utas meteorite...@gmail.com Cc: meteorite-list@meteoritecentral.com Date: Saturday, 12 December, 2009, 16:12 For any interested in this topic, Aubrey Whymark has a nice page on large tektites here http://www.tektites.co.uk/largest_tektites.html. You owe it to yourself to have a look at the rest of his site as well. It's very comprehensive. FYI, Phil On Sat, Dec 12, 2009 at 5:21 AM, Jason Utas meteorite...@gmail.com wrote: Hello Steve, All, I've hear tell (and seen photos) of a Muong Nong layered tektite in the 40-50kg range in Thailand, but the asking price was around a dollar a gram. They do come big, but they're rarely seen above about a kilo or so. Regards, Jason On Sat, Dec 12, 2009 at 4:11 AM, steve arnold stevenarnold60...@yahoo.com wrote: Good early morning list.Got to put in another 10 hour day.Last of a 65 hour week.Hey I noticed on ebay someone is selling a 3.8 kilo tektite.I s it possible to be that big?I've seen them many hundreds of grams but not 7 lbs. I s it really possible?? Steve R. Arnold, Chicago!! __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Not OT-- set our journals free!
Hi I thought that anything paid for by the US taxpayer had to be public access - hence all the NASA articles available free. Personally the standard $30 charge a paper disgusts me and serves to obstruct science. You used to be able to buy paper copies much cheaper - now they are online you would think they would be cheaper - but instead they are 10 times more expensive! $30 for one A4 page!?! I try and get my papers from geological/astronomical libraries or second hand books/journals. Buying digital copies would bankrupt me - and it annoys me because tax payers funded the research and these companies extort the profit. With the decline in print copies it won't be long before online purchase is the only option and then with these giants like Elsevier we will all suffer and private researchers will be no more. If Elsevier or other big publishers want to hold the copyright then they should pay for the ENTIRE research / Ph.D. - if they don't then the article should be publicly available if funded by the public. I hope there are new laws on copyright before scientific articles are only available to the very wealthy. No problems with a $10-15 charge to cover costs plus some profit, but these prices are crazy. I've complained, but I never get a reply! Maybe it is time that people refuse to publish with these guys and go with journals that offer free or cheap online access (but still peer reviewed) - at least people could then afford to read the article. Now there's an idea for a webpage! Regards, Aubrey www.tektites.co.uk --- On Sat, 12/12/09, Darren Garrison cyna...@charter.net wrote: From: Darren Garrison cyna...@charter.net Subject: [meteorite-list] Not OT-- set our journals free! To: meteorite-list@meteoritecentral.com Date: Saturday, 12 December, 2009, 20:53 We've all seen it-- some new paper (on meteorites or not) comes out from a publicly funded entity, paid by US taxpayers, but to read the paper, you must pay an obscene fee (such as $20 to have access to 1 article for 24 hours-- or some similar rate-- from _Science_.) Here's a chance to give TPTB a little feedback on that: http://pandasthumb.org/archives/2009/12/comment-on-acce.html __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Big Bang Origin Of The Moon (Tektite Related)
What a fruit loop. This theory has more holes in it than swiss cheese. Does he think the moon is made of cheese too? I stopped reading half way through. Aubrey www.tektites.co.uk --- On Thu, 29/10/09, Michael Groetz mpg4...@gmail.com wrote: From: Michael Groetz mpg4...@gmail.com Subject: [meteorite-list] Big Bang Origin Of The Moon (Tektite Related) To: Meteorite List Meteorite-list@meteoritecentral.com Date: Thursday, 29 October, 2009, 0:04 Big Bang Origin Of The Moon Explosive ejection from the Philippine Sea Plate http://www.scoop.co.nz/stories/SC0910/S00066.htm Coleman speculates that the Philippine Sea Plate was once an enormous hole out of which the Moon exited, and left a strewen field, or trail, of previously unexplained glassy tektites... __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Dry Lakes in Australia
Hi Greg They certainly look for Australite Tektites on the dry lakes in WA. Australites can be picked up, kept, sold, sold abroad. You can't touch the Meteorites in Australia though. If you find one then report it to the Museum. For this reason I doubt that people go out specifically looking for Meteorites as it would cost a lot for zero reward. Regards, Aubrey Whymark www.tektites.co.uk --- On Wed, 14/10/09, Greg Stanley stanleygr...@hotmail.com wrote: From: Greg Stanley stanleygr...@hotmail.com Subject: [meteorite-list] Dry Lakes in Australia To: meteorite-list@meteoritecentral.com Date: Wednesday, 14 October, 2009, 10:41 PM List: The company I work for is doing a project in Australia and I'm coordinating the placement of some of our instruments. As I looked at the map in GoogleEarth, I notice (what looks like dry lakes) throughout the country; does anyone look for meteorites on dry lakes in Australia? Greg S. _ Hotmail: Trusted email with Microsoft’s powerful SPAM protection. http://clk.atdmt.com/GBL/go/177141664/direct/01/ __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Stretch Philippinite Tektites!
Hi List Check out my images of two stretch tektites found in the Philippine: http://www.tektites.co.uk/stretch.html (half way down) There is an interesting story: Des Leong of www.tektiteinc.com showed me the 66.1g specimen and asked if I thought it was a stretch tektite. I said 'no' as Philippinites re-entered as solid bodies (unlike Indochinites). It was a curio though with a stretched bubble area sandwiched between two circular bubble areas. Then today I was cataloging some tektites I bought in January 2009. In that lot I found a very similar specimen weighing 32.2g. It had a stretched bubble area sandwiched between two circular bubble areas (same as before). In this case, however, there was very clear twisting of the molten area. Not necessarily the classic stretch tektite, but nonetheless I've come round to the fact that stretched tektites can be found very very rarely in the Philippines - perhaps one per 100 or 150 kilos. I think these must have formed in the ejection phase though, as I'm certain that Philippinites re-entered as solid bodies (why? well even one kilo tektites show no distortion - In Indochina spheres sagged into donuts/tori. In the Philippines they stayed as spheres even in the biggest tektites that would have remained molten the longest). Anyway, enjoy the images, I wanted to share them! Aubrey www.tektites.co.uk __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Dry / dehumidifier cabinets
Hi List I was in a photography shop here in Manila and saw some fantastic glass fronted dry cabinets ideal for meteorite collectors. I only keep tektites here in Manila so I don't need one! The prices were very reasonable ranging from about $150 for a small one to $300 for a larger one. I saw two brands and you can view them here: http://www.drycabinet.com.au/main.html http://www.eurekadrytech.com/pro01.aspx The first is Australian and the second Taiwanese so no idea if they are available outside of Australasia, but I hope they are! Maybe someone should stock them! Regards, Aubrey www.tektites.co.uk __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Book Titled: The history of meteoritics and keymeteorite collections
Hi You can get a good idea on Google Books http://books.google.com.ph/books?id=7SvtVoa1W-cCpg=PA123lpg=PA123dq=The+history+of+meteoritics+and+key+meteorite+collectionssource=blots=VYykBJ52ljsig=KDOt2h-3RuKbIxp7BIBc5dDHRUkhl=tlei=h_eNSvboKoGgkQXvm8C7Cgsa=Xoi=book_resultct=resultresnum=1#v=onepageq=f=false Also reviews at http://www.geolsoc.org.uk/gsl/publications/bookshop/page1331.html FYI the Geological Society often discounts the price very heavily for members and this is further reduced in the regular sales. For the book 'Tektites in the Geological Record: Showers from the Sky' the list price is GBP65, but I paid GBP25. I'm afraid I am not in UK, but in the Philippines, making ordering for others impractical, but maybe there are other members on the list. Regards, Aubrey --- On Thu, 20/8/09, Matt Morgan m...@mhmeteorites.com wrote: From: Matt Morgan m...@mhmeteorites.com Subject: Re: [meteorite-list] Book Titled: The history of meteoritics and keymeteorite collections To: Greg Stanley stanleygr...@hotmail.com, meteorite-list-boun...@meteoritecentral.com, meteorite-list@meteoritecentral.com Date: Thursday, 20 August, 2009, 10:14 PM I did one for Palaios last year: http://www.paleo.ku.edu/palaios/reviews2008.html. It is about halfway down the page in PDF format. Matt Morgan http://www.mhmeteorites.com --Original Message-- From: Greg Stanley Sender: meteorite-list-boun...@meteoritecentral.com To: meteorite-list@meteoritecentral.com Subject: [meteorite-list] Book Titled: The history of meteoritics and keymeteorite collections Sent: Aug 20, 2009 3:08 PM List: Does anyone have a review on the following book: The history of meteoritics and key meteorite collections: fireballs, falls and finds, By Gerald Joseph Home McCall, A. J. Bowden, Richard John Howarth I have just discovered it and it looks interesting, but expensive $190.00 Thanks, Greg S. _ Get back to school stuff for them and cashback for you. http://www.bing.com/cashback?form=MSHYCBpubl=WLHMTAGcrea=TEXT_MSHYCB_BackToSchool_Cashback_BTSCashback_1x1 __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list Matt Morgan Mile High Meteorites http://www.mhmeteorites.com P.O. Box 151293 Lakewood, CO 80215 USA __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Darryl Futrell huge Philippinite
Hi List On the same link I posted earlier regarding the tektite lamp: http://picasaweb.google.com/lh/photo/JHsNghP_3Rcb0QbP9zHr_w?authkey=Gv1sRgCM6XzLrq76-GKQfeat=directlink does anyone know what happened to the huge Beyer Philippinite weighing 1,065g (1,069g on Beyer's scales)? It'd be good to know where this one ended up. Large tektites are still coming out of Bikol but are very rare. In the last couple of years (to my knowledge) there have been a few over 700g, maybe 1 over 800g and none above this. Des and I frequently get reports of 1 kilo tektites but they always turn out to weigh much less. There may be a few more that are in the hands of other western/asian foreigners but again the weight is usually much exaggerated by the sellers who cannot afford scales. The largest original tektite spheres always fragment (like the other two irregular specimens shown). Presumably they are thermodynamically unstable above 1 kilo. Regards, Aubrey www.tektites.co.uk __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Darryl Futrell Tektite Lamp
Hi List Unfortunately I never knew Darryl Futrell. I have, however, read many of his articles which I certainly find interesting even if I do not agree with the conclusions. In an article titled 'The Lunar Origin of Tektites' in Rock Gem Feb 1999 there is a photo of a fantastic Tektite 'Tiffany' Style lamp. This was made by Dan Wright from natural un-cut thin splashform tektites from Thailand. See it here: http://picasaweb.google.com/lh/photo/JHsNghP_3Rcb0QbP9zHr_w?authkey=Gv1sRgCM6XzLrq76-GKQfeat=directlink Does anyone know what happened to this lamp? Also are there any more in existence? It is a fantastic piece! Regards, Aubrey www.tektites.co.uk --- On Thu, 13/8/09, bernd.pa...@paulinet.de bernd.pa...@paulinet.de wrote: From: bernd.pa...@paulinet.de bernd.pa...@paulinet.de Subject: [meteorite-list] In memoriam Darryl Futrell - Gone but not forgotten To: Meteorite-list@meteoritecentral.com Date: Thursday, 13 August, 2009, 12:26 PM Dear List, Saturday, 21 July 2001, Darryl sent me these lines: Would you believe I have a letter from the Chinese Academy of Sciences in Beijing, from one of their top two tektite researchers, inviting me to go there and do tektite field work with them? Monday, 13 August 2001, Darryl passed away after a severe heart attack. Of course, he would have loved to accept this invitation, but, alas, in the same mail he also wrote: Six or more years ago, I would have gone, but now there's no way. Best wishes, Bernd __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Rob Elliott's Auction in the press
Hi Old news in the British and Irish Meteorite Society (sorry can't post on that list for some reason). New news in the Daily Mail - Rob Elliott is auctioning off his collection. http://www.dailymail.co.uk/sciencetech/article-1190626/Meteorite.html Regards, Aubrey __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Rob Elliott's Meteorite Auction in the press
Hi Old news in the British and Irish Meteorite Society (sorry can't post on that list for some reason). New news in the Daily Mail - Rob Elliott is auctioning off his collection. http://www.dailymail.co.uk/sciencetech/article-1190626/Meteorite.html Regards, Aubrey __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Dealers, Sellers: Please INSURE your shipments
I am always careful about declaring a meteorite - it makes it tempting to steal. 'Mineral specimen for research' is accurate and yet far less tempting to steal. Also I prefer not to declare the full value. When I have stuff sent to the Philippines I like a low value as again it reduces the risk of theft (although I have never experienced a problem). The main problem I have is that if a high value is declared then I have to pay import duties, and various other taxes and post office expenses that basically convert a bargain ebay purchase into very expense deal - almost to the point that it's not worth picking up, due to the expense. I once bought $120 of tektites and then had to pay $60 to the post office to get them! Aubrey __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Request from Kenya on suspect rock
I agree with Mark Clearly siliceous - looks like flint or chert. Definitely not a meteorite. Aubrey __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Best institutional tektite collections?
Hi List I started some museum pages on my website a while back, it would be great to add to these museums if anyone has photos of tektite collections. www.tektites.co.uk/museums The British Museum of Natural History currently has a very poor display, bar a few nice Ivory Coast tektites. I believe this may improve in the future. The French Natural History Museum sadly has no tektites on display, despite the work by Lacroix. I believe the Czech Natural History Museum has a good display, but I have no more information. In Australia I guess there are a number of excellent displays - Certainly a good display is found in the Western Australian Museum. In the US I have little information - if you have some info and photos of tektite displays you can email me at aub...@tektites.co.uk for inclusion in my webpage. I have learnt that Virgil Barnes donated his collection to the Texas Memorial Museum In the Philippines I believe there are no displays. There used to be one at the Planetarium, but that was under renovation, and I believe still is. No idea if tektites will be back on display there when it opens again. Regards, Aubrey www.tektites.co.uk On Sun, Apr 19, 2009 at 9:43 AM, Phil Morgan roxfromsp...@gmail.com wrote: Hello everyone, I was wondering where some of the better tektite collections are located and how much is on display. I'm mostly interested in the US but feel free to include others. Any suggestions? Thanks, Phil __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Velocity a meteorite hits the ground?
Thanks for all the replies! Whilst I wasn't happy about being hit by hail stones, I'm pleased I wasn't hit by a meteorite! Mind you, that would be a real hammer and I'm sure the money would pay the medical expenses for a new hand! Regards, Aubrey __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Velocity a meteorite hits the ground?
Hi I'm sure this is a very simple question. The other day I was caught in a hail storm and was hit by 30-35mm diameter hail stones. One hit my exposed hand and made a nasty bruise. At what speed were these hail stones falling? By comparison, at roughly what speed do meteorites fall assuming they have lost all of their cosmic velocity. I am assuming it will be a little faster as meteorites are heavier and so the drag will have less of an effect. Thanks, Aubrey __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Tektites
Hi I just read Bill's post about Plain Text. So this is how you post to the Meteorite List! I gave up trying to post ages ago as my posts never got through! I thought it was because I didn't live in America! Whats New? http://www.tektites.co.uk/whats-new.html Recently I've written about the largest tektites in the world (I need you help!), about Vietnam tektites and done some You Tube videos - my first attempt! Also check out my Indochinite and Philippinite formation pages! http://www.tektites.co.uk/indochinites.html and http://www.tektites.co.uk/philippinites.html Loads of other tektite pages too! Also I apologise in advance about any delay in replies. I'm in the Persian Gulf on a satellite connection. Thanks, Aubrey Whymark www.tektites.co.uk __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Tektite internal structure and Andas plus Bediasites
Hi I've added some images to my website www.tektites.co.uk. I have some excellent images of Bediasites from Brian Burrer in Texas. Many thanks to Brian! http://www.tektites.co.uk/19.html Also I have some notes on Anda tektites and also on ice cubes and tektite internal structure http://www.tektites.co.uk/9.html and http://www.tektites.co.uk/37.html Also some attached navals on Philippinites, that I have mentioned previously. http://www.tektites.co.uk/8.html (at bottom). From tomorrow I am off email for a bit, but any feedback I will respond. Research is on hold for a few weeks whilst I work though! As always ideas are evolving, Enjoy! Regards, Aubrey - Yahoo! Mail is the world's favourite email. Don't settle for less, sign up for your freeaccount today.__ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] TEKTITE SCULPTURE Anda, V-grooves and U-grooves
Hi I know this may be nothing new to folk who have been collecting tektites many years, but it is something that has fascinated me recently and may be of interest to some collectors. I have recently updated my website dedicated to tektites. It is an ongoing process as ideas and opinions evolve. I appreciate that other people may have different opinions. My recent updates include that on Anda sculpture and V-grooves www.tektites.co.uk/9 and on evolving ideas about gutters and navals on Philippinite biscuits www.tektites.co.uk/8. Many other pages have been modified, but as always time is a great constraint. Basically, I discuss Anda sculpture and V-grooves in Philippinites and Indochinites and conclude that it is almost certainly due to chemical etching and essentially no different to the patterns very well developed in Moldavites (from Besednice in particular) and also occurs in Bediasites and Australites. Is the internal radiating pattern a cooling product? I then return to naval formation on Philippinite biscuits. With 2 specimens that I aquired from Desmond Leong of www.tektiteinc.com it appears that my original ideas on naval formation and flight orientation were incorrect. As I said, ideas evolve and I won't stubbonly stick to things that don't work, hence the change in my website. In these specimens from Camarines Norte, Philippines, which are finely grooved like javanites, shell material is clearly seen attached to the naval. These photos are fascinating. This also leads to questions as to whether U-grooves of biscuits and breadcrusts have been enlarged by etching along pre-defined cracks. If this is the case, then why U-shaped and not V-shaped etching? Note that I may be out of town shortly so unable to reply to feedback. Many thanks and I hope you enjoy the site! Aubrey www.tektites.co.uk - Yahoo! Answers - Get better answers from someone who knows. Tryit now.__ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] London Clay ??Tektites
Hi Regarding the possible London Clay microtektites. I have just received some more data from the finder. It doesn't look good as I report below. I hope you appreciate that I am simply reporting information as I receive it and in hind sight maybe I should have held back a bit. These spherules were, however, reported in the very reputable Geologists' Association Magazine, and this is how I came to hear about them. These spherules were analysed in 1994 by Glan Izett of the USGS. The spherules did not contain any Radiogenic 40Ar and it was thus concluded that the spherules had zero geologic age. The Major element electron micro-probe analyses of the glass-like spherules gave the following results: SiO2 31.92 31.57 32.30 Al2O316.00 15.74 15.96 MgO 5.60 5.83 5.65 FeO0.26 0.27 0.27 CaO40.2240.2340.06 Na2O 0.26 0.27 0.27 K2O0.71 0.76 0.78 MnO 0.85 0.92 0.93 BaO0.07 0.10 0.05 TiO2 0.61 0.65 0.63 TOTAL 96.51 96.3796.89 The high amount of CaO and SiO2 certainly does not favour tektite glass. It is interesting, however, that the proposed source crater (Silverpit Crater) would be within the Upper Cretaceous Chalk (around 96% CaCO3). The collector of the spherules, Michael Daniels, states 'Those that are familiar with my site activities, the way I conduct my researches, from digging out the accumulations usually from foreshore exposures, then the method by which the pockets are rendered down here to acquire searchable residues, all would unquestionably confirm the veracity of my contentions concerning both the remarkable Naze biota, and the various unusual minerals, other items, not only the tektites, in my collection.' I am simply reporting the facts as I recieve them - I will leave you to draw your own conclusions on these data. Certainly the analyses are far from favourable and the zero geologic age will prove difficult to overcome. Personally I would like to visit the site to follow-up. Regards, Aubrey - Yahoo! Answers - Got a question? Someone out there knows the answer. Tryit now.__ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] More on London Clay Microtektites
Hi Michael Daniels, who discovered the London Clay tektites has recently emailed me a little more information, which I'd like to pass on: When it comes to your correspondent's doubts, which they are fully entitled to submit, particularly suspicions raised about the possibility of contaminates, origins connected with fly-ash and power stations, volcanics, yes, they are all familiar observations con- cerning the particles. And, as before, I just make the suggestion that for those more doubtful, they come down here and I will gladly conduct them to the Naze when I shall be more than appreciative to hear their explanations as to where I may have, in my enthusiasm, become a little adventurous in my concept and having unquestioning belief in the antiquity of the little glassy objects. That might be for me an acid test, but actually I think when they have better appreciation of the conditions prevailing at this lower London Clay locality, I think I can win over a few potential critics. Just to deal with a couple of questions raised by those who have written. I have today once more checked the particles and none show any magnetic properties. Some do have voids and there is a little evidence of impurities, but if that is confirmed then just might be tiny specs of dirt or plant debris. As for their pristine state, no sign of them suffering any ablation. Many of the fossil bird bones that I have collected from the Walton site are in such a remarkable condition that I have had to be careful when comparing them with modern avian elements, so perfect are they that confusion over which is which could arise. This is because once the relics came to rest on the sea bed and were fast covered with sediment, there they remained down 55 (not 35!) million years until they were caused to emerge when I dug up the pocket, composed mainly of plant material, in which they were lodged and so reveal them once more to the light of day! The tektites have a high Ca content and this factor through those who expect them to show substantial silica in their make up. But the people that found difficulty with such a composition, in my view, simply had an inability in grasp that some things in heaven and earth are literally beyond the powers of human understanding. Have a pleasant weekend Sincerely Michael Thanks for all the feedback, Aubrey (out of contact for a bit in the Middle East, so apologies if I don't reply) www.tektites.co.uk - Yahoo! Mail is the world's favourite email. Don't settle for less, sign up for your freeaccount today.__ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] British Lower Eocene London Clay Tektites
Hi I just wanted to draw attention to these possible microtektites from the Lower Eocene London Clay in England. The finder, Michael Daniels, has very kindly provided a number of images and some notes. http://www.tektites.co.uk/13.html What do people think of these possible microtektites? Are they comparable with other microtektites found? Interestingly some of the microtektites seem to have extra 'spikey' features (see photos) - is this normal? Thanks, Aubrey www.tektites.co.uk P.S. out of contact from 26th May for a bit. - Now you can scan emails quickly with a reading pane. Get the new Yahoo! Mail.__ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Tektite Surface Question Anda
Hi Yes I have a few more ideas and intend to add to the website (www.tektites.co.uk) in a week or two when I return to the UK. Also check out my links page. I want to write more on the Anda sculpture (and V-grooves) and more on my belief that the impact site is in the Bay of Tonkin, where any depression would be very rapidly covered by deltaic sediments. This best fits the distribution of tektites, wheras Tonle Sap doesn't make so much sense. I'll do a bit on ejecta distribution patterns too. Also I am getting a better feeling for some of the sculpture on Indochinites so I'll be adding to that also. So, who paid $561 dollars for the moldavite-like Anda Indochinite slim teardrop on ebay? A truely unique specimen with some interesting implications on the chemical weathering argument. If you have this stone I would kill for an image. I have a similar, but poorer example. Contact me at [EMAIL PROTECTED] Also, have you seen the spinning tektites (sadly all sold) at http://www.meteorite.fr/en/forsale/tectite.htm - you don't need an explanation on how these formed! Amazing specimens. Regards, Aubrey Moni Waiblinger [EMAIL PROTECTED] wrote: Or read more info on this url from Aubrey Whymark www.tektites.co.uk Great reading material and images! With best regards, Moni _ MSN is giving away a trip to Vegas to see Elton John. Enter to win today. http://msnconcertcontest.com?icid-nceltontagline __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list - Yahoo! Answers - Got a question? Someone out there knows the answer. Tryit now.__ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] +++ New Australasian Tektite Webpage! +++
Hi www.tektites.co.uk I'd like to present to you my new tektite webpage. The primary focus is on Australasian tektites, with a lot on Philippinites. In time I'll add more on Australites and Indochinites. It presents my current ideas, which I hope will evolve in the future so that some solid understanding of tektite morphologies and sculpture is developed, where it does not already exist. I think I have some interesting observations on sculpture and surface textures, particularly in Philippinites. I hope this website will demonstrate how fascinating and diverse tektites are. People often just have a poor Indochinite splashform in their collection and think that is that. There is so much more!! Regards, Aubrey - What kind of emailer are you? Find out today - get a free analysis of your email personality. Take the quiz at the Yahoo! Mail Championship.__ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] AD: RIZALITES FOR SALE or TRADE!!!
Hi list members, Sorry for not posting this myself! I'm having a lot of problems subscribing to the Met list. I have been a quiet reader of the list for over a year now! Ive got a bunch of Rizalites that Im looking to trade for some Henbury, Mundrabilla, Camel Donga or Millbillillie specimens, you can see that I'm a patriotic Australian! I will also add cash to the trades if needed. Im looking for 1000grams and above specimens. I will also sell my Rizalites if anyone is interested. Please visit my site or eBay offerings. Thanks all. Regards, Desmond www.TektiteInc.com eBay - http://search.ebay.com/_W0QQsassZtektiteinc-dot-com _ - Now you can scan emails quickly with a reading pane. Get the new Yahoo! Mail.__ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] AD: RIZALITES FOR SALE or TRADE!!!
Hi list members, Sorry for not posting this myself! I'm having a lot of problems subscribing to the Met list. I have been a quiet reader of the list for over a year now! Ive got a bunch of Rizalites that Im looking to trade for some Henbury, Mundrabilla, Camel Donga or Millbillillie specimens, you can see that I'm a patriotic Australian! I will also add cash to the trades if needed. Im looking for 1000grams and above specimens. I will also sell my Rizalites if anyone is interested. Please visit my site or eBay offerings. Thanks all. Regards, Desmond www.TektiteInc.com eBay - http://search.ebay.com/_W0QQsassZtektiteinc-dot-com _ - All New Yahoo! Mail Tired of unwanted email come-ons? Let our SpamGuard protect you.__ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Australites/Philippinites - grooving - any info?
Hi list I wondered if there is anyone on the list who has collected a lot of australites and knows about the grooving on these tektites. What does it look like? Is it generally on the anterior side? Is it associated with particular shapes and not others? I am really interested to understand how australite morphologies fit in with the classic lenticular and breadcrust philippinites, which have grooving on only one side. I was also fascinated by the recent emails on stretch tektites. The more I look at philippinites, the more I think the U grooves are an original feature as oppose to chemical weathering. The U grooves occur on only one side and, when better developed, have a polygonal structure. I know this is usually explained as being the anterior side with flakes coming off due to thermal expansion/contraction, but I still wonder if that is the case. I wonder if these cracks developed (?perhaps as the tektite cooled) but the interior remained plastic. When this interior became solid, the solid would take up less space than the liquid. So, when it cooled totally did it 'suck' in at the grooves. I saw a similar thing when playing with solid and liquid wax. Are the grooves on one side then lost due to ablation, thus making the smooth side the anterior? Are these grooves in anyway similar to the starburst ray skin-splits featured on 'The Tektite Source' webpage? I understand this idea creates more problems, such as why do tektites from Vietnam area not show polygonal cracks like philippinites. I'm sure there is still much to be learnt, but if anyone knows answers I'm keen to learn. Thanks, Aubrey - The all-new Yahoo! Mail goes wherever you go - free your email address from your Internet provider.__ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Philippinites - shape formation ideas.
Hi Guys TEKTITE PHILIPPINITE SHAPE FORMATION I have been purchasing a large number of philippinites here in Manila. These philippinites, I have been told by my supplier, come from Baguio. Baguio is in Central Luzon (the large northern island of the Philippines) and forms highland – with conifers growing in the cool climate. I visited this place and found no tektites (or anybody who knew what a tektite was). Here in Manila I am buying as much as I can. My supplier, who has collected for 20 years, has not got any new ones for 3 years now, and I think I have already got the best out of him. They are not that cheap and have pretty much used all my money up – so I’ll be selling a few at some point (probably in December). My observations have led me to some conclusions that differ slightly from previous articles I found on the internet (although I have not checked my references in UK). Philippinites are characterised by their ‘u’ grooves. These ‘u’ grooves only tend to develop on one side and this is what I intend to discuss. Philippinites come in a variety of shapes including ‘breadcrust’ forms (which look like half-soccer balls), dumbbells and tear drops, the classic ‘5’ grooved ‘cores’ and spheres. Interestingly, on average, philippinites appear larger than I had imagined. My biggest is around 360g, with many around 50g. Interesting articles on the internet are: http://www.tektitesource.com/Bikolites.html http://www.meteorite-times.com/Back_Links/2002/November/Tektite_of_Month.htm My pictures (refer to with the following text) are in the BIMS homepage: http://tech.ph.groups.yahoo.com/group/britishandirishmeteoritesociety/photos/browse/8c74?c= The observations made in ‘The Tektite Source’ were excellent and from what I’ve seen I fully agree with them. The observations made by Paul Harris in the meteorite times were also excellent, but I wish to argue about the anterior/posterior side. Polygonal cracks are commonly found in geology. The best example is in basaltic lavas such as the classic ‘Giants Causeway’ in Ireland. Polygonal cracks are caused by contraction due to cooling. The cool side of a tektite on re-entry is the posterior (in australites material solidifies on the posterior as it is cooler). My second piece of evidence is the Apollo re-entry craft (meteorites were studied for its design I believe). I note that on philippinites the smooth side is always shield-like. It is pretty similar in most specimens, but the grooved side is variably convex (and usually more convex than the smooth side). My third piece of evidence comes from the large specimen pictured. Unfortunately this did not come out well in the photo, so is not shown. On the ‘smooth’ side is an originally textured surface. But in one area it is smoothed off – a feature I have also observed on some indochinites from Thailand. It looks as if it landed on this surface whist still hot and slightly plastic. The ‘thud’ flattened an area and removed any pock-marking, which exists on the rest of the rounded surface. So, large philippinites form ‘breadcrusts’ which kind of look like half-soccer balls. On these ‘breadcrusts’ a smooth shield-like anterior (facing direction of travel) surface forms. On the posterior (behind) the tektite cools faster, thus forming polygonal cooling contraction cracks. These polygonal areas can crack off in flight and can leave a smaller core of about 1-4cm in size, not to mention numerous ‘side’ pieces. These ‘cores’ often have a rounded polygonal outline. These smaller tektites may of course, already have just been small. They show the classic shield-like anterior and grooved posterior. The cracks on the posterior are the same as on larger specimens but only develop as typically 5 cracks on the edge with no interior polygon developed. The ‘u’ grooves formed due to chemical weathering along lines of weakness – which are the cooling contraction cracks. The end result is spectacularly beautiful tektites, surpassed only by the australites. I’m interested in any comment regarding this subject. Tektites have fascinated me for 15 years now. Kind Regards, AubreySend instant messages to your online friends http://uk.messenger.yahoo.com __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] New Zealand: more 'meteorites' on their shelves....
Looks exactly like a marcasite/pyrite nodule. We get loads from the Cretaceous Lower Chalk in Southern England that look identical. They are also regularly confused with meteorites. AubreyMarco Langbroek [EMAIL PROTECTED] wrote: Every odd rock in New Zealand now starts to be a meteorite it seems. Here'sthe newest:http://times-age.co.nz/news2004/040616b.htmlNo likely meteorite if I look at this picture. Markasite nodule perhaps?- Marco--Marco LangbroekLeiden, the Netherlands52.15896 N, 4.48884 E (WGS 84)e-mail: [EMAIL PROTECTED]website: http://home.wanadoo.nl/marco.langbroekweblog: http://home.wanadoo.nl/marco.langbroek/iss_log.html--__Meteorite-list mailing list[EMAIL PROTECTED]http://six.pairlist.net/mailman/listinfo/meteorite-list ALL-NEW Yahoo! Messenger - so many all-new ways to express yourself __ Meteorite-list mailing list [EMAIL PROTECTED] http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Cutting lubricant/coolant and blades
Hi list, I was looking for a suitable water soluble coolant for cutting meteorites with. Diacut sounds good but, so far as I can see, it is only available in America. Whilst I am am having some odd bits of equipment shipped over to the UK, I would imagine shipping a load of liquid may get expensive. Does anyone know of a decent product available in the UK and a good lapidary dealer? I was wondering about theuse of automobile coolant additives instead. At the end of the day they contain corrosion inhibitors and water-coolant. I could mix it with distilled water and use them instead..maybe? I am not cutting anything rare or valuable and would, of course, give them alcohol baths and heat treatments afterwards. (with alcohol baths I have found that leaving them in excess of 2-3 days may result in break up of weathered meteorites - any comment?) As regards blades, Iunderstand from previous emailsthat Dean uses Pro Slicer diamond blades for cutting Chondrites (correct me if I am wrong). Are CBN blades better for Chondrites due to the metal content? - I understand they would be essential for irons as diamond blades are not good on metals. I will, however, be concentrating on Chondrites. Any help would be appreciated. I am a hobbyist keen to cut a few specimens myself. Thanks in advance, Aubrey Whymark Yahoo! Messenger - Communicate instantly..."Ping" your friends today! Download Messenger Now__ Meteorite-list mailing list [EMAIL PROTECTED] http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Meteorites / Mining Claims
Hi Have a read of Norton's Rocks From Space (2nd Ed) p.251 on the Old Woman Meteorite. I'm sure that you can hunt for meteorites but neither youself or the owner of the mining claim owns the meteorite. This is because meteorites are not a 'locatable mineral'. If the meteorite was found on public land the United States Government is the legal owner. If on private land I assume the land owner is the legal owner. The Old Woman meteorite is now at the Bureau of Land Management (BLM) California Desert Information Center in Barstow. The finders recieved nothing. I wonder if the same ruling would have been applied if Barringer had been successful in locating a large meteorite below Meteor Crater, Arizona. Maybe it's a size thing. Aubrey [EMAIL PROTECTED] wrote: Hi List, I would like to know if you are allowed to hunt for meteorites on mining claims.If one is found, who owns the meteorite, The finder or the claim owner? Thanks,. Sonny Yahoo! Messenger - Communicate instantly..."Ping" your friends today! Download Messenger Now
Re: [meteorite-list] NWA 1933
Armoured chondrules are when the chondrule is surrounded by a thin rim of metal. They probably form due to impact shock melting. AubreyAnita Westlake [EMAIL PROTECTED] wrote: Love the "Solar System Stew" description. By the way, what do you mean by "armoured"? Anita ---Original Message--- From: Jeff Kuyken Date: Thursday, January 29, 2004 12:34:09 AM To: Meteorite List Subject: [meteorite-list] NWA 1933 G'day folks, I just received a slice of NWA 1933 from Mike Farmer today. I strongly recommend taking a look at the pics.This isone of the; if not THE BEST, ordinary chondrites I have ever seen! It seems like no two chondrules are the same andheaps ofthem are armoured. Under magnification you can see inclusions within inclusions (achondritic clasts?)and the colours are pretty spectacular! All in all, it's like a solidified primordial Solar System stew! Cheers, Jeff KuykenI.M.C.A. #3085www.meteorites.com.auwww.meteoritesaustralia.com IncrediMail - Email has finally evolved - Click HereBT Yahoo! Broadband - Free modem offer, sign up online today and save £80
[meteorite-list] Preventing rust
Hi I had a problem a while back with a couple of ordinary chondrites rusting. I followed the advise offered on Meteorites Australia and would like to recommend the process to other people. http://www.meteoritesaustralia.com/oddsends/ironrust.html After polishing the specimens using distilled water I simply got an old jam jar, filled it with methylated spirit, added about a table spoon of caustic soda (both available from DIY stores), added the meteorite and left it for about 10 days. This process has, so far, made the specimens much more stable. When carrying out this process be sure to wear disposable gloves. Skin and caustic soda don't mix too well. AubreyBT Yahoo! Broadband - Free modem offer, sign up online today and save £80
[meteorite-list] Look on the Moon for the first evidence of life on Earth?
From a previous email:"Our research shows the structures found in the NASA meteorite were more than likely made by bacteria present on Mars four billion years ago - before life even started on Earth." Discussion: We don't have the rocks on Earth to accurately say when life started because of recycling due to plate tectonics. The oldest rock is 4.03 Ga old. The ancient rocks we are left with have been through a lot and are often highly metamorphosed. See the following link for ages of the oldest Earth rock: http://pubs.usgs.gov/gip/geotime/age.html The oldestbacterial fossils on Earthare 3.5 billion years old but probably originated before that. The rocks are often so metamorphosed that any fossil traces will be destroyed. The isotope ratios between Carbon-12 and Carbon-13, however,indicate life was present as much as 3.85Ga ago (although this has been questioned). Then, tiny zircon crystalsreworked into younger rocks, but dating back to 4.3Ga to 4.4Ga, suggest possibilities life may be even older. They indicate the possibility of oceans and environments in which microbial life could emerge - 4.3 billion to 4.4 billion years ago. As the ancient rocks on Earthare either not available due to plate tectonics or highly metamorphosed it has been suggested that the best place to look for life on Earth may be on the moon. Ancient terrestrial rock would have made it to the moon relatively unaltered. See the following very interesting article. http://www.nature.com/nsu/021028/021028-13.html AubreyBT Yahoo! Broadband - Free modem offer, sign up online today and save £80
Re: [meteorite-list] xenolith vs. polymict breccia?
Walter Branch [EMAIL PROTECTED] wrote: Hi Yes the term xenolith would apply to the individual clast. It is a term used to describe something foreign or exotic that really shoulnd't be there. If the clast was the same as the matrix I would hesitate to use it but if it were different then it seems like a good term. Igneous rocks can certainly have xenolithic clasts of other igneous rocks, sedimentary rocks and metemorphic rocks. As an intrusion forces its way through country rock it will often pick up such clasts. If individual crystals are picked up which do not belong to that melt, but to another, these are termed xenocrysts. I would struggle to envisage chondrites being caught up in an igneous melt on an asteroid though. This would surely imply only partial melting of the body. If the two were found together it would surely be in a breccia and the chondritic component wouldn't be encased in the igneous component. A rubble pile could certainly have igneous clasts such as eucritic fragments in an LL body for instance. Aubrey Hi Aubry, Thanks very much for your comments. Yes, I was considering rocks with a matrix. I must admit, I had not thought of rocks without a matrix - clast supported vs. matrix supported. That is a very interesting distinction.Now I have yet another term with which I can try to impress my wife (not an easy thing to do after 17 years of marriage:-) Would the term xenolith apply to the individual clasts in a polymict breccia? Could an igneous rock have axenolithic clast of non-igneous material or could a sedimentary (e.g., rubble pile) type host have an igneous clast, thus making bothpolymict breccias? I suppose given enough collisions among asteroids, any combination is possible (e.g., chondritic monomict breccia's with exoctic igneous clasts). Perhaps in descriptions of meteorites the terms polymict xenolithic breccia and monomict xenolithic breccia should be used as oppose to just xenolithic breccia which to me does not distinguish whether the clasts are the same or not. It merely says that at least some of the clasts are different to the matrix. Yes, as you have described it, this makes sense. Aubry (and everyone) I have received an email from a recently former list member who reports that there is a paper which describes formal guidelines on the description xenolithic inclusions in meteorites: Binns R.A. (1968) Cognate xenoliths in chondritic meteorites: Examples in Mezö-Madaras and Ghubara (GCA 32, 299-317). Hope this helps. Thanks again for your comments. -Walter --www.branchmeteorites.com - Original Message - From: Aubrey Whymark To: [EMAIL PROTECTED] Sent: Saturday, January 24, 2004 9:41 AM Subject: Re: [meteorite-list] xenolith vs. polymict breccia? Hi Sorry for the length of this reply. Got carried away! Go to bottom 3 paragraphs for summary. You are right.A polymict breccia descibes a sedimentary rock made up of angluar clasts of different rock whilst a monomict breccia refers to a sedimentary rock made up of angular clasts of the same rock. A brecciacan be clast supported (the clasts are touching) or matrix supported (clasts are not touching). If clast supported, a matrix may or may not be present. The term xenolith refers to a foreign rock or clast incorporated into another rock. Traditionally I would tend to only use this term when refering to igneous rocks but it could be used for exotic clasts in sedimentary rocks (and chondrites). Ghubara is an example,being classified as a xenolithic chondrite. If using the term xenolith you are probably implying a matrix is present. The matrix is local, in the case of chondrites, and the xenolith not local - it came from elsewhere. If you were to apply the term xenolith to a matrix free polymict breccia the xenolith would simply have to be the less abundant type of clast. This is not satisfactory as just because it is less abundant does not neccessarily make it the 'foreign' bit. This is my understanding of rock names: Angular clast of same composition, no matrix = monomict clast supported breccia Angular clasts of different composition, no matrix = polymict clast supported breccia Angular clasts of same composition with matrix also of same composition = monomict clast or matrix supported breccia Angular clasts of same composition in a matrix of different composition = monomict clast or matrix supported brecciaor xenolithic chondrite. Angular clasts of different compositions in a matrix = polymict clast or matrix supported breccia or xenolithic chondrite ( but if the matrix is the same as some of the clasts the term xenolith would only apply to the different composition clasts) So, to summarise, in my opinion a monomict or polymict breccia can be the same thing as a xenolithic chondrite. Xenolithic simply implies some or all the clasts are different to the matrix of the rock. The terms polymict and monomict do not consider the matrix. Perhaps
Re: [meteorite-list] xenolith vs. polymict breccia?
Hi Sorry for the length of this reply. Got carried away! Go to bottom 3 paragraphs for summary. You are right.A polymict breccia descibes a sedimentary rock made up of angluar clasts of different rock whilst a monomict breccia refers to a sedimentary rock made up of angular clasts of the same rock. A brecciacan be clast supported (the clasts are touching) or matrix supported (clasts are not touching). If clast supported, a matrix may or may not be present. The term xenolith refers to a foreign rock or clast incorporated into another rock. Traditionally I would tend to only use this term when refering to igneous rocks but it could be used for exotic clasts in sedimentary rocks (and chondrites). Ghubara is an example,being classified as a xenolithic chondrite. If using the term xenolith you are probably implying a matrix is present. The matrix is local, in the case of chondrites, and the xenolith not local - it came from elsewhere. If you were to apply the term xenolith to a matrix free polymict breccia the xenolith would simply have to be the less abundant type of clast. This is not satisfactory as just because it is less abundant does not neccessarily make it the 'foreign' bit. This is my understanding of rock names: Angular clast of same composition, no matrix = monomict clast supported breccia Angular clasts of different composition, no matrix = polymict clast supported breccia Angular clasts of same composition with matrix also of same composition = monomict clast or matrix supported breccia Angular clasts of same composition in a matrix of different composition = monomict clast or matrix supported brecciaor xenolithic chondrite. Angular clasts of different compositions in a matrix = polymict clast or matrix supported breccia or xenolithic chondrite ( but if the matrix is the same as some of the clasts the term xenolith would only apply to the different composition clasts) So, to summarise, in my opinion a monomict or polymict breccia can be the same thing as a xenolithic chondrite. Xenolithic simply implies some or all the clasts are different to the matrix of the rock. The terms polymict and monomict do not consider the matrix. Perhaps in descriptions of meteorites the terms polymict xenolithic breccia and monomict xenolithic breccia should be used as oppose to just xenolithic breccia which to me does not distinguish whether the clasts are the same or not. It merely says that at least some of the clasts are different to the matrix. Does anyone know of some formal guidelines on the description of meteorites? There must be some somewhere which give the formal definition of a xenolithic chondrite. Regards, Aubrey Walter Branch [EMAIL PROTECTED] wrote: Hello Everyone, What is the difference between a xenolith and a polymict breccia? Is it that the xenolithic host is igneous, whereas the polymict breccia is sedimentary? -Walter --www.branchmeteorites.com Yahoo! Messenger - Communicate instantly..."Ping" your friends today! Download Messenger Now
