[meteorite-list] Gem quality periodot's from meteorites
Are there any sources for gem quality periodots fron pallasite meteorites? with cut and pollished stones up to 5 carats? it would require cutting thick slabs of pallasites rather than the thin slices currently available, then using the larger clear pieces to be cut into ring quality gems. cheers Steve __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Space ice
From: Mike Hankey mike.han...@gmail.com Happy Labor Day Everyone, I've heard some people talk about how sometimes meteors can be big balls of ice. How common is this? Specifically what are the chances that the PA fireball I'm looking for could have been an ice ball? That would really suck. From: Richard Kowalski damoc...@yahoo.com Hey Mike, I'm wondering if it is Louis Frank's Mini-Comets that you heard being discussed? Rather, I think Mike refers to a common cometary origin meteor (not meteorite). Most meteors are cometary in origin. So yes, many fireballs are made of volatile stuff. Don't expect any Leonid meteor, however how bright it is, to produce meteorites for example. They are too volatile, and too fast for that, and disintegrate completely. Taurid meteors, another cometary shower renowned for producing autumn fireballs, are slower, but still, chances of meteorites of them are slim as it concerns volatile particles (comet Encke debris). Fast velocity, high orbit inclinations, are all indications of a cometary origin. Slow velocity and a radiant on the ecliptic point to a probable asteroidal origin (there are exceptions though!), and then chances are it could be a meteorite dropper. Then, there are the stories of lore about chunks of ice reaching earth surface. Usually these are either hailstones, or ice from airplane wings. But there are a few stories that are more intruiging. Peter Jeniskens once got a lady telling him how during a beachwalk a small black thing dropped out of the sky and disintegrated in the beach sand in front of her eyes, with a sizzling sound. - Marco - Dr Marco (asteroid 183294) Langbroek Dutch Meteor Society (DMS) e-mail: d...@marcolangbroek.nl http://www.dmsweb.org http://www.marcolangbroek.nl - __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Cooling or...
or the impacts stopped the crystal growth of the irons, causing muionalusta, gibeon and campos having the same or similar age yet different band widths depending on when an impactor stopped the crystal growth of the widmanstattens. cheers Steve --- On Mon, 9/7/09, E.P. Grondine epgrond...@yahoo.com wrote: From: E.P. Grondine epgrond...@yahoo.com Subject: [meteorite-list] Cooling or... To: mstrema...@yahoo.com Cc: meteorite-list@meteoritecentral.com Date: Monday, September 7, 2009, 4:50 PM Hi Elton - What I am wondering is if the compression forces are so large that an alloy does not form, but rather compounds, which then freeze in place when the compression forces are nearly instantaneously released. 250 seems like a lot of parent bodies. Ed E.P. Grondine Man and Impact in the Americas __ 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] List Member wins Photography Contest
Hi all, Our own Darren Garrison has won a photography contest on Panda's Thumb. http://pandasthumb.org/archives/2009/09/photo-contest-w.html#more To see the finalists, go here: http://pandasthumb.org/archives/2009/08/photo-contest-v-1.html#more Congrats Darren! Nice job! Best regards, Charley Well, squids don't work. Hey! Let's try elephants ! Hannibal __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Rocks from Space Picture of the Day - September 8, 2009
http://www.rocksfromspace.org/September_8_2009.html __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] List Member wins Photography Contest
Our own Darren Garrison has won a photography contest on Panda's Thumb. Nice Photo...I didn't realize that hummingbirds were that aggressive to other critters besides other hummingbirds. Interesting... GeoZay __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] AD-Auctions Ending-Thousands $$ Started At Just 99 Cents!
Dear List Members, Several excellent auctions are due to end this afternoon. Thousands of dollars worth of material was loaded and started at just 99 cents. Be sure to take a look as I cannot afford to give away meteorites much longer as most of these have been selling below my costs lately. All of these items are definitely worth a look as there is treasure everywhere! All Auctions Can Be Found At This link: http://shop.ebay.com/merchant/raremeteorites!_W0QQ_nkwZQQ_armrsZ1QQ_fromZQQ_mdoZ Planetary Material Started At Just 99 Cents: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200379629696 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200379630322 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=140343427101 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200379632987 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200379633392 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=140343428262 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200379634551 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200379634783 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200379635926 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=140344662474 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200381665930 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=140344665674 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200381669546 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=140344666000 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200381670185 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=140344667090 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200381671963 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=140344668068 Dhofar 700 Vesiculated Diogenite Specimens- Started at Just 99 Cents: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200379630720 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200381666132 PRICE REDUCED: NWA 2626 Martian Shergottite, MAIN MASS - DO NOT BE AFRAID TO MAKE AN OFFER AS I WILL SELL BELOW MY COSTS: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200374037684 S.O.S. - SAVE OFF THE SAW - OTHER RARE MAIN MASSES THAT WILL BE PLACED ON THE SAW AND CUT DOWN IF NOT SOLD: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200374036148 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200374036909 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200374037865 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200374038095 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=200374038314 And many more fine examples worth looking at can be found at this link: http://shop.ebay.com/merchant/raremeteorites!_W0QQ_nkwZQQ_armrsZ1QQ_fromZQQ_mdoZ Thank you for looking and if you are bidding, good luck. Best Regards, Adam Hupe The Hupe Collection Team LunarRock IMCA 2185 raremeteori...@yahoo.com __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Rocks from Space Picture of the Day/ El Haggounia aubrite?
Hello Bob and list, I'm not sure if there is any active debate but I believe there are still issues. A good summary of the problems with this material and pairings is documented here: http://www4.nau.edu/meteorite/Meteorite/Al_Haggounia.html Regards, Phil On Tue, Sep 8, 2009 at 10:31 AM, Bob Kingnightsk...@gmail.com wrote: Hi Mike and all, That was a fun picture today but one question -- I thought the El Haggounia aubrite was classified as an EL3. Is there still debate on this material? Thanks, Bob On Tue, Sep 8, 2009 at 10:08 AM, spacerocks...@aol.com wrote: http://www.rocksfromspace.org/September_8_2009.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 __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Rocks from Space Picture of the Day - September 8, 2009
Nice photo, but Al-Hagg is an EL3 enstatite chondrite, not an aubrite. :) On 9/8/09, spacerocks...@aol.com spacerocks...@aol.com wrote: http://www.rocksfromspace.org/September_8_2009.html __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list -- . Michael Gilmer (Florida, USA) Member of the Meteoritical Society. Website - http://www.galactic-stone.com FaceBook - http://www.facebook.com/galacticstone MySpace - http://www.myspace.com/fine_meteorites_4_sale Twitter - Twitter - http://twitter.com/GalacticStone eBay - http://shop.ebay.com/merchant/maypickle .. __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] oriented stone or iron
Hi list.I am looking for a stone or iron meteorite,prefferably unclassified that is oriented and with heavy flow lines.I am looking to spend around $700.Please off list. Steve R. Arnold, Chicago!! __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Rocks from Space Picture of the Day/ El Haggounia aubrite?
Hi Mike and all, That was a fun picture today but one question -- I thought the El Haggounia aubrite was classified as an EL3. Is there still debate on this material? Thanks, Bob On Tue, Sep 8, 2009 at 10:08 AM, spacerocks...@aol.com wrote: http://www.rocksfromspace.org/September_8_2009.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
[meteorite-list] Chrome Question
List, I have a question about chrome. What is the highest percentage of chrome found in iron meteorites? Thanks Carl -- Carl or Debbie Esparza IMCA 5829 Meteoritemax __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] NASA to Announce Selection of Target Crater for Lunar Impact of LCROSS Spacecraft
Sept. 8, 2009 Grey Hautaluoma/Ashley Edwards Headquarters, Washington 202-358-0668/1756 grey.hautaluom...@nasa.gov, ashley.edward...@nasa.gov Jonas Dino Ames Research Center, Moffett Field, Calif. 650-604-5612 jonas.d...@nasa.gov MEDIA ADVISORY: M09-171 NASA SELECTS TARGET CRATER FOR LUNAR IMPACT OF LCROSS SPACECRAFT MOFFETT FIELD, Calif. -- NASA has identified the spot where it will search for water on the moon. Reporters are invited to attend the announcement of the target location where the Lunar Crater Observation and Sensing Satellite, or LCROSS, and its spent Centaur rocket will hit in October. The briefing will take place at 10 a.m. PDT, Friday, Sept. 11, in the main auditorium, Building N201, of NASA's Ames Research Center in Moffett Field, Calif. The event will be broadcast live on NASA Television and the agency's Web site. The selected crater is an optimal target for evaluating if water ice exists at the lunar south pole. Briefing participants are Daniel Andrews, LCROSS project manager, Anthony Colaprete, LCROSS principal investigator, and Jennifer Heldmann, lead for the LCROSS observation campaign. Andrews will provide an update about the health of the spacecraft and mission activities. Colaprete will announce the target crater and explain the criteria and selection process. Heldmann will discuss the LCROSS observation campaign in which an international cadre of professional and amateur astronomers will view the impacts at 4:30 a.m. on Oct. 9. To reach Ames, take U.S. Highway 101 to the Moffett Field/NASA Parkway exit and drive east on Moffett Field Boulevard toward the main gate. News media will be escorted from the visitor badge office parking lot to the main auditorium at 9:45 a.m. Journalists seeking telephone access should contact Jonas Dino at 650-604-5612 or jonas.d...@nasa.gov. For NASA TV streaming video, downlink and scheduling information, visit: http://www.nasa.gov/ntv For more information about the LCROSS mission, visit: http://www.nasa.gov/lcross -end- __ 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
Re: [meteorite-list] Lunar question
Randy, far be it from me to put words in your fingers, but I recall in an earlier (a year or two ago) post from you on lunar regolith breccias, you mentioned that in a lunar breccia, the clasts are more or less randomly sized, while in most terrestrial breccias, the clasts are mostly of similar sizes because of wind, water, or gravity sorting them. (Correct me if I'm wrong with this addition to your list.) Darren: Yes, I should have mentioned that. Most terrestrial sedimentary rocks are what sedimentologists call sorted. All grains in a certain size range are deposited at the same distance from the shoreline. But, with no wind and water and little gravity, the fragmental material on the surface of an asteroid or the Moon is not sorted. There's a continuum from small to big. I think of a lunar regolith of fragmental breccia as being fractal - it doesn't make any difference what scale you're look at. It always looks the same. Unfortunately, terrestrial volcaniclastic rocks are also not well sorted. Randy Korotev __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] cooling rate of irons. drifting to Planetary atmospheres
Predictions have been made of such doomsday scenarios. There's a good one in the book Gaia by Lovelock that begins with some genetic engineering experiment going wrong and it ends up stopping photosynthesis. The predictions are that eventually the Earth would end up with an atmosphere very similar in proportions to Venus and Mars, both of which are around 97% CO2 with much of the remainder nitrogen and argon. I forget the surface pressure predicted, I think it was in the region of 90Bar but whether it was more or less I can't remember. Eventually, the Carbon sealed in rocks would be liberated without photosynthesis to fix it and free oxygen is inherently unstable long term without photosynthesis to replace it. The irony is that Venus would have started warmer than the Earth and may have been more conducive to the beginnings of life than the earth. Please, don't anyone suggest panspermia from Venus to Earth. That whole topic seems madness to me. As the sun warmed up, the increased global temperatures would have driven surface water higher into the atmosphere as the troposphere became saturated where it eventually contributes to global warming rather than cooling by increasing the surface pressure. (This is an oversimplification for brevities sake. I can elucidate to anyone sufficently interested, preferably off list. Not everyone is as anal about these things as I am) The action of UV light will dissociate H2O at high altitude and the hydrogen will escape to space leaving free oxygen to react with sulphur compounds put into the atmosphere by volcanic eruptions. Sulphucic acid at high altitude is a very potent greenhouse gas (I am told though I will admit I didn't look that up at uni and haven't done since, either) The whole thing runs away. Whether Venus began a progression to an Earth-like world and then ran away with the greenhouse or whether it has always been like it is is not known. Still, it provides a stark warning for us on the lil ol earth. Mars, by contrast has insufficient mass to hold onto a thick atmosphere for more than a few hundred Ma, even at lower initial temperatures. So in 4.56Ga, venus ends up with a 90Bar atmosphere of similar composition to Mars' 0.01Bar atmosphere. Earth sits nicely in between with its highly modified atmosphere thanks to the actions of plants. Venus' slow rotation (retrograde, even depending on you frame of reference) seems likely caused by a large impact early in its life, though the loss of a sufficiently large moon would correspond to a big enough loss of spin angular momentum too. The moon would need to be about the mass of Mercury. Whether Mercury was once a moon of Venus or not seems of low probability but if this were the case, the question of where Venus' moon went would need answering. Considering a large moon seems a vital part in stabilising the spin of a terrestrial planet allowing for complex life to develop (the mixing produced by tides allows for a regular distribution of energy and resources in the shallow water where sunlight can reach near coastlines), I kinda like the Mercury was a moon of Venus idea. It makes complex life far more likely elsewhere. It would mean 2 of 3 terrestrial planets had large moons (mercury no longer being a planet) rather than 1 of 4. Rob McC --- On Tue, 9/8/09, Darren Garrison cyna...@charter.net wrote: From: Darren Garrison cyna...@charter.net Subject: Re: [meteorite-list] Slow cooling rate of irons in space To: Rob McCafferty rob_mccaffe...@yahoo.com Date: Tuesday, September 8, 2009, 4:22 AM On Mon, 7 Sep 2009 18:37:23 -0700 (PDT), you wrote: Oi! I touched on this. Am I an ivisible voice? Just joking with you. Oh, you? I have you killfiled. Actually, I saw your points after I went back and gave the thread a more through reading after the first skimming. Given a rotation of 24(ish) hrs, I wonder what the preictions for Venus would be should life such as it is on earth be prevelant. If the atmosphere was the same thickness, I'd think it would still be Pretty Damn Hot. I'm no planetologist, but I can't off the top of my head think of how the slow period of rotation would be able to lead to what would otherwise be a thin atmosphere. Of course, we don't know how long Venus has had an atmosphere like it is currently. Maybe, if life had taken hold, it would have been able to evolve some feedback loop keeping the atmosphere from getting too thick (precipitating out carbon dioxide as calcium carbonate, and such.) __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Lunar question
On Tue, 08 Sep 2009 15:39:31 -0500, you wrote: sorted. There's a continuum from small to big. I think of a lunar regolith of fragmental breccia as being fractal - it doesn't make any difference what scale you're look at. It always looks the same. Speaking of fractal details and the moon, I ran across this the other day: http://www.planetary.org/blog/article/2061/ (The last image.) __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] What is and isn't a Widmanstatten Pattern was Cooling rates
--- On Mon, 9/7/09, Jeff Grossman jgross...@usgs.gov wrote: Most of the metallic minerals in iron meteorites are described as alloys in that they are composed of various metals combined together. I understood the distinction was that the Fe Ni formed a chemical compound not merely a mixture like copper and tin to make brass but even brass can form crystalline plates so that may be a bad example. It was my understanding that were it not for the mineral structure The Fe-Ni would be called an alloy. Agreed that it is frequently discussed in terms of alloy. It does not happen as the metal cools from the liquid state and solidifies. I stand corrected, 30 years is a lot of facts to keep in just one's head. I did recall correctly that there is a temperature range and below which all translocation stops. Seems off the top of my head it is 800°C. Goldstein and coworkers have shown that the process is controlled by the Fe-Ni-P phase diagram. I have long suspected that phosphorus was a key component in the process--likely as a catalyst. The Schreibersite seems to exist largely at the boundaries in thin laminae even surrounding trolite nodules. I look forward to reading Goldstein's paper. Thanks again, Elton __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] test
test _ 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
Re: [meteorite-list] What is and isn't a Widmanstatten Pattern was Cooling rates
I guess once again as with CCDs my education is outdated. I see that any metal compound or mixture can be called an alloy. OR it has come into such common use the distinction between mixture and compound is obsolete when talking about metals. Elton --- On Tue, 9/8/09, Mr EMan mstrema...@yahoo.com wrote: From: Mr EMan mstrema...@yahoo.com Subject: Re: [meteorite-list] What is and isn't a Widmanstatten Pattern was Cooling rates To: Meteorite-list meteorite-list@meteoritecentral.com, Jeff Grossman jgross...@usgs.gov Date: Tuesday, September 8, 2009, 6:38 PM --- On Mon, 9/7/09, Jeff Grossman jgross...@usgs.gov wrote: Most of the metallic minerals in iron meteorites are described as alloys in that they are composed of various metals combined together. I understood the distinction was that the Fe Ni formed a chemical compound not merely a mixture like copper and tin to make brass but even brass can form crystalline plates so that may be a bad example. It was my understanding that were it not for the mineral structure The Fe-Ni would be called an alloy. Agreed that it is frequently discussed in terms of alloy. It does not happen as the metal cools from the liquid state and solidifies. I stand corrected, 30 years is a lot of facts to keep in just one's head. I did recall correctly that there is a temperature range and below which all translocation stops. Seems off the top of my head it is 800°C. Goldstein and coworkers have shown that the process is controlled by the Fe-Ni-P phase diagram. I have long suspected that phosphorus was a key component in the process--likely as a catalyst. The Schreibersite seems to exist largely at the boundaries in thin laminae even surrounding trolite nodules. I look forward to reading Goldstein's paper. Thanks again, Elton __ 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] Antitaenite
I see that a new mineral came and went last decade and I don't recall a discussion of it on the list. Course the list was may not have been around in 1995! It was found in Vaca Muerta. Fe3Ni. I also see that the IMA rejected it as a new mineral. Passed along for your perusal from the wikipedia article: http://en.wikipedia.org/wiki/Antitaenite Antitaenite is a meteoritic metal alloy mineral composed of iron and nickel, 20-40% Ni (and traces of other elements) that has a face centered cubic crystal structure. Its existence as a new mineral species occurring in both iron meteorites and in chondrites was first recognized in 1995.[1] There are three other known Fe-Ni meterotic minerals: kamacite, taenite, and tetrataenite. The pair of minerals antitaenite and taenite constitute the first example in nature of two minerals that have the same crystal structure (face centered cubic) and can have the same chemical composition (same proportions of Fe and Ni) - they differ in their electronic structures: taenite is a high magnetic moment alloy whereas antitaenite is a low magnetic moment alloy. This unique difference in electronic structure was first established in 1999[2] and arises from a high-magnetic-moment to low-magnetic-moment transition occurring in the Fe-Ni bi-metallic alloy series.[3] The same electronic structure transition is believed to be a causal factor in Invar behaviour. Elton __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Plessite and Schreibersite. was Widmanstatten Pattern
As the ravages of time rake through my memory...some is coming back to me. The mineral Plessite is an intermediate mixture of both taenite and kamacite. It may be the bulk mineral in iron meteorites. I need to find it it is also the composition of the iron flecks in common chondrites of does that nickel-iron come in various flavors? I am remiss for not speaking of plessite more frequently when talking about kamacite and taenite. Its name even means filling ( Gr:plythos) It's German name is Fulleisen Buchwald and Massalski named some varieties(according to Wikipedia): * acicular plessite/Type I plessite * black plessite/Type II plessite * cellular plessite/Type III plessite * comb plessite * net plessite * pearlitic plessite * spheroidized plessite My recollections are that schreibersite favors almost exclusively taenite boundaries( I may be mistaken again) and this is where I got insight into my private hypothesis that phosphorus is a critical factor in differentiating taenite from kamacite on the macro level. I suspect(dangerous I know) that the schreibersite bands/fronts, once developed provide a catalyst zone preferential for taenite and/or nickel, drawing it through the laminae and stacking it behind the front. As the taenite builds up the front advances into the plessite so long as the temperature remains within the phase envelope. Now if I can find that envelope... I can't begin to theorize how schreibersite accreted to the band that it does when it does but it seems to have a propensity to do so. In ataxites schreibersite can form crystals plates instead of bands. Owing to its yellow brassy color my be mistaken for troilite. I am throwing this out in case anyone has some journal articles on the subject or cares to discuss the chemistry. If and when I find the specific of past research I'll pass that along. For now I want to get the Goldman pdf file and see what I should already know at my age. Elton __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Frank's hypothesis
Hi all - Theoretical physics question of the day: Years ago I read of a stable Earth-Moon orbital path. Now the Earth outgasses, so some of this would appear to go into this orbital path. Could water accrete there in that path, and then return to Earth, or would the vacuum just tear any accretion apart again? In any case, it looks like what Frank saw was an instrument artifact. Ed __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] RePallasites
Hello list, I have a question. I have a piece of Brenham, Ks. It has very slim metal dividers that seperate the Olivine crystal pockets. There are other Pallasites that have much thicker metal dividers with smaller Olivine pockets. The questionwould the former be formed further from the core than the latter? In other words, are there differences in the Olivine/Ni-Fe ratio if the meteorite comes from the area closer to the core or further away from the core per a cubic meter quantity of each. Pete IMCA 1733 __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Frank's hypothesis
It is a statistical certainty that Apollo era urine is still in lunar and Terran orbit Perhaps it has been freeze dried. Would make an interesting micrometeorite. Elton --- On Tue, 9/8/09, E.P. Grondine epgrond...@yahoo.com wrote: From: E.P. Grondine epgrond...@yahoo.com Subject: Re: [meteorite-list] Frank's hypothesis To: meteorite-list@meteoritecentral.com Date: Tuesday, September 8, 2009, 10:17 PM Hi all - Theoretical physics question of the day: Years ago I read of a stable Earth-Moon orbital path. Now the Earth outgasses, so some of this would appear to go into this orbital path. Could water accrete there in that path, and then return to Earth, or would the vacuum just tear any accretion apart again? In any case, it looks like what Frank saw was an instrument artifact. Ed __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] 99 cent Lunar Martian Auctions - AD
Dear List Members, Another week, and another set of 'Steal-of-A-Deal' auctions ending tomorrow (Wednesday, September 9th). A slow start to bidding means great deals for those who are willing to check 'em out! Aside from the above mentioned deals, I also have listed the last four Ocate, New Mexico iron specimens, a True American iron! In addition to these, the last pieces of the incredible 3-Layer Cake, A Visual Treat - NWA 5407, an amazing Impact Melt! The last specimens of these have been listed for 30-Day auctions with Make Offer Option. I thought I would try something new and see how it goes. Click here for my current eBay auctions: http://search.ebay.com/_W0QQsassZnaturesvault Thanks for bidding! I hope you win what you are after!! Best regards, Greg Greg Hupe The Hupe Collection NaturesVault (eBay) gmh...@htn.net www.LunarRock.com IMCA 3163 Click here for my current eBay auctions: http://search.ebay.com/_W0QQsassZnaturesvault __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] RePallasites
Hello Pete, I'm not as well-versed in the science of such things as many on the list, but I would point out that there are many multi-kg specimens of Brenham that are composed entirely of iron. Other good examples of similar features occurring in meteorites including, but not limited to, Seymchan, initially mis-classified as a IIE iron because no olivine was observed in the first pieces discovered, as well as the Glorieta Mountain pallasite - the main mass was, from what I've heard, was 100% nickel-iron, with some troilite and schreibersite inclusions. Well, have a look: http://www.nyrockman.com/auction-2008/lots/seymchan3376g.htm http://www.meteoritefinder.com/catalog/glorieta-col-947.htm http://www.meteoritefinder.com/collection/glorieta-101.7.htm http://www.meteoritefinder.com/collection/glorieta-175.6.htm To that end, I believe it's safe to say that the spacing of the olivine crystals has noting to do with distance from the core. Regards, Jason On Tue, Sep 8, 2009 at 8:26 PM, Pete Shugarpshu...@clearwire.net wrote: Hello list, I have a question. I have a piece of Brenham, Ks. It has very slim metal dividers that seperate the Olivine crystal pockets. There are other Pallasites that have much thicker metal dividers with smaller Olivine pockets. The questionwould the former be formed further from the core than the latter? In other words, are there differences in the Olivine/Ni-Fe ratio if the meteorite comes from the area closer to the core or further away from the core per a cubic meter quantity of each. Pete IMCA 1733 __ 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] Frank's hypothesis
On Tue, 8 Sep 2009 20:28:39 -0700 (PDT), you wrote: It is a statistical certainty that Apollo era urine is still in lunar and Terran orbit Perhaps it has been freeze dried. Freeze dried water? Okay, mostly water. In an ugly bag. __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Chondritic parent bodies
All, Pete's question re: pallasites reminds me of one I've been meaning to throw out to the group for a while. I believe that, by definition, L6's come from one parent body and L5's, say, come from another. It's clear why breccias might simply be an association of the two. But I've seen cross section illustrations of hypothetical asteroids more than once which indicate a transitional progression from L3 material at the exterior/crust through L4, then L5, and eventually to L6 at the center/core. Presumably this is due to insulative properties and the like towards the interior which allow more heat from radioactivity to build up, etc, but this also seems to indicate a single parent body. I'm sure Sterling Co. might have a field day with this one, and I'm looking forward to any responses out there... Thanks much, Dave Dave Gheesling IMCA #5967 www.fallingrocks.com __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Chondritic parent bodies
PS - Darren has been kind enough to send some great resources along off list. I can't recall where the notion of separate parent bodies denoted by alteration first hit my screen, but I'm rather certain it was here on the list. Having previously assumed three parent bodies (H, L, and amphoterite) all along, that one hit me by surprise. The rapid movement in meteoritics must have taken my threshold of assumption with it. Reminiscent of looking for my sunglasses all over the house last weekend, only to realize the search was being conducted through them...on my face. Anyway, one of these days I might know enough to read and actually comprehend more than half the articles in MAPS, but until then this list is one fantastic resource -- even for dumb questions (which, at the end of the day, are the ones which aren't asked). Thanks again, Darren! DG -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of Dave Gheesling Sent: Tuesday, September 08, 2009 11:40 PM To: 'Meteorite List' Subject: [meteorite-list] Chondritic parent bodies All, Pete's question re: pallasites reminds me of one I've been meaning to throw out to the group for a while. I believe that, by definition, L6's come from one parent body and L5's, say, come from another. It's clear why breccias might simply be an association of the two. But I've seen cross section illustrations of hypothetical asteroids more than once which indicate a transitional progression from L3 material at the exterior/crust through L4, then L5, and eventually to L6 at the center/core. Presumably this is due to insulative properties and the like towards the interior which allow more heat from radioactivity to build up, etc, but this also seems to indicate a single parent body. I'm sure Sterling Co. might have a field day with this one, and I'm looking forward to any responses out there... Thanks much, Dave Dave Gheesling IMCA #5967 www.fallingrocks.com __ 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] Great Lead - Dead End
Hey Guys, I got this lead last week: Mike, I was reading the Lancaster paper tonight and saw about the meteorite-I think this clears something up for me- I am in New Holland, Pa on the early morning of July 6th, I couldnt sleep and was watching tv- all the sudden I heard a huge bang right outside my 2nd story bedroom( scared the living outta me. I peeked out and didnt see anything, I thought at the time someone must have thrown a m-80 or something at my window-upon inspecting better in the morning there is a huge dent on the top of my patio roof with black splat marks, right underneath my bedroom window-it also left a couple holes. I looked around on the ground to see if I could see anything there, but now i will have to check a little harder, after seeing your pic in the paper. But I am sure now that is what it was, because my house does not have easy access to my back yard-Thanks for the article but I think you need to be looking north of intercourse-Jeane I went out to her house last Thursday and Friday and again tonight. I got on the top of the main roof tonight and saw what could be more damage (but could also be nothing)... I ran an earth magnet through the dirty in the flower beds near her porch... I got a lot of hits, there is a lot of metal in the ground. I've posted pics and a full a report on my site: http://www.mikesastrophotos.com/baltimore-pa-meteor/great-lead-dead-end/ I feel like this is a really great lead, but I've done just about all I can do and I'm still coming up empty. I have gotten some feedback that suggests the dent in the roof does not look like a meteorite-dent. Any suggestions are much appreciated, I'm really stumped on this and don't know what I should do next. Thanks, Mike P.S. For what its worth, Jeane lives a couple miles away from Blue Ball, PA (which is pretty much what i got searching for meteorites at her house). __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
