[meteorite-list] Cybexx Meteorite-watches Con
Hola list, wanna laugh? http://cgi.ebay.de/NEU-Cybexx-Meteoritenuhr-als-Digitaluhr-empf-VK-169-00_W0 QQitemZ8902289212QQcategoryZ55219QQrdZ1QQcmdZViewItem (item 8902289212) German ebay at present is flooded with those watches (and I fear soon US-ebay too). The CYBEXX METEORA ! Text says: Accuracy from another star With meteorite quartz. The new dimension of horology: The CYBEXX Meteora receives its impulses from an authentic meteorite-quartz. Nasa-researchers discovered in the desert of Arizona the exceptional physical properties of meteoritic matter. Crystals from inside (sic!)show not only an incredibly perfect symmetry, but also an up to now unknown accurate clock pulse. Rejoice in the unique precision from another star and wear this watch with the sensation to be in contact with the universe. Wow and you even will get a certificate of authenticity!! Never heard of that firm Cybexx, will be Chinese stuff. Buckleboo! Martin PS: Perhaps I should say for the rookies, that quartz in a stone is a bad sign. A criterion to exclude, that a stone is a meteorite. (yaya I know, in some enstatites, shergottites and in some eucrites, there might be quartz, but in such minor amounts, that if you see a shiny quartz with your bare eyes in a stone, one can say: hands off!) __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list]
Transparent Seymchan 23 grams, 82mm by 52mm by 1.5mm thick. http://www.catchafallingstar.com/images/ebay/Seymchan23.JPG Jim Strope 421 Fourth Street Glen Dale, WV 26038 http://www.catchafallingstar.com - Original Message - From: M come Meteorite Meteorites [EMAIL PROTECTED] To: Meteorite-list@meteoritecentral.com Sent: Thursday, February 16, 2006 11:40 AM Subject: Re: [meteorite-list] Why are Esquel slices Transparent Blue? This is my new 2 Seymchan slices, one with olivines, and another with mesosiderite type matrix http://it.geocities.com/mcomemeteoritecollection/Seymchan187.7.JPG http://it.geocities.com/mcomemeteoritecollection/Seymchan63.6.JPG Matteo --- M come Meteorite Meteorites [EMAIL PROTECTED] ha scritto: I have just received 3 fantastic seymchan slices over 150 grams with olivines, later I photograph and I put in my site... Matteo M come Meteorite - Matteo Chinellato Via Triestina 126/A - 30030 - TESSERA, VENEZIA, ITALY Email: [EMAIL PROTECTED] Sale Site: http://www.mcomemeteorite.it Collection Site: http://www.mcomemeteorite.info MSN Messanger: spacerocks at hotmail.com EBAY.COM:http://members.ebay.com/aboutme/mcomemeteorite/ ___ Yahoo! Mail: gratis 1GB per i messaggi e allegati da 10MB http://mail.yahoo.it __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Iron Meteorites May Be Solar System Boomerangs
http://www.newscientistspace.com/article.ns?id=dn8729 Iron meteorites may be solar system boomerangs Maggie McKee New Scientist 16 February 2006 Iron meteorites thought to have originated in the asteroid belt beyond Mars may actually have formed near Earth, a new study reports. The work may resolve a mystery over why only a few asteroids appear to have melted in the past and could offer researchers insights into the composition of the Earth's interior. Iron meteorites are made up of iron and nickel alloys and comprise about 6% of all catalogued space rocks on Earth. Like their stony meteorite counterparts, they are thought to have fallen to Earth after being nudged out of the asteroid belt between Mars and Jupiter. But unlike their stony cousins, iron meteorites are thought to have come from asteroids that were once so hot they had melted, and differentiated into layers. In this process, heavy elements like iron would have sunk to the asteroids' centres - the source of the iron meteorites - and lightweight, lava-like basalts would have solidified on their surfaces. Studies show that the known iron meteorites come from about 80 different parent asteroids, while the thousands of known stony meteorites broke off from just 40 or so parent bodies. That suggests astronomers should see many differentiated asteroids in the asteroid belt today, says William Bottke of the Southwest Research Institute in Boulder, Colorado, US. Curious problems But observations have turned up few basalt-covered asteroids, and asteroid families - fragments of larger parent bodies that broke up after a collision - show no signs of differentiation, says Bottke. The asteroid belt seems to be telling us something very different than the meteorite record, Bottke told New Scientist. It raises a lot of curious problems. So Bottke and colleagues approached the problem by considering how asteroids become differentiated. Asteroids are thought to melt from the heat produced by the radioactive decay of isotope aluminium-26. This isotope has a half-life of only 700,000 years, so melting should have occurred only on those asteroids that took shape shortly after the solar system formed, about 4.6 billion years ago. Gravity causes objects closer to the Sun to move around it more quickly. That means that dust clumps should have collided more often near the Sun to form rocky bodies, and that those bodies should have melted. If you expect melting to happen anywhere, it's going to take place closer to the Sun than farther away, says Bottke. Prodigal sons return Bottke and his colleagues ran computer models of small bodies forming near the Sun and discovered that interactions with the rocky inner planets could have caused these bodies to break up. The interactions also caused a small fraction of them - about 1% of those that formed near Earth, and about 10% of those born near Mars - to be scattered outward into the asteroid belt. There, they would have remained in stable orbits for several billion years until gravitational interactions with other objects and radiation from the Sun nudged some onto paths towards Earth, where they fell as iron meteorites. The scenario may explain why so few objects in the asteroid belt appear differentiated, and why recent studies of iron meteorites show they are 1 million to 2 million years older than stony meteorites, Bottke says. It may also reveal the composition of our planet's primordial building blocks, he adds: Iron meteorites may tell us what the precursor material for the primordial Earth was like. Journal reference: Nature (vol 439, p 821) __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Acapulcoites and NWA 725
I'm must be missing something. What could one conclude by comparing thin sections of NWA 725 and a known winonaite? I understand that distinguishing among acapulcoites, lodranites and winonaites is not a textural exercise nor can they be resolved by just their mineral composition. Hello John and List, I thought other list members might also be interested in this thread, so I hope you don't mind me sending this mail to the List as well. No, you are not missing anything. Hand samples of acapulcoites, lodranites and winonaites look pretty much the same tan color (at least to me). Only the micro- scope will reveal their subtle textural differences and only a thin section in polarized light will show mineralogical differences or differences in grain size. Unortunately I still don't have a thin section of an acapulcoite but the one pictured in Marvin Killgore's Color Atlas of Meteorites in Thin Section on pages 208-211 (Acapulco) surely looks different than the winonaite on pages 232-235 (NWA 1054). Something readily noticed is grain-size: The grains in winonaites are usually smaller than in acapulcoites. I know, unfortunately their grain sizes overlap as a comparative overview on p. 252 of Hutchison (Meteorites: A Petrologic, Chemical, and Isotopic Syn- thesis ) shows. To make matters even worse: almost all cited properties overlap :-( Maybe the amount of troilite in NWA 725 could help here. According to Hutchison, acapulcoites have 3-6 vol% FeS whereas winoaites have 1-19 %. The mineral composition of NWA 725 may also be useful in determining whether it is a winonaite or an acapulcoite. Olivine Fo and orthopyroxene En have (slightly) higher values in winonaites, and the same is valid for plagioclase An. Unfortunately both acapulcoites and winonaites can have relict chondrules, so this doesn't help either. But what may help is the fact that winonaites are more depleted in 16-O and so plot closer to the terrestrial fractionation line than acapulcoites. Well, you are right ... a thin section will not disclose such information so I can only repeat what I already mentioned above: grain size and visual appearance of thin sections of winonaites and acapulcoites - they just look different to me and Hutchison also states: The winonaites are texturally similar to acapulcoites, but the winonaites contain coarser grains and abundant crosscutting metal-sulfide veins. So, maybe, the grain size of NWA 725 visible under the microscope does hold a clue ... Cheers, Bernd __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Acapulcoites and NWA 725
Hmm ?!? Just noticed something contradictory: The winonaites are texturally similar to acapulcoites, but the winonaites contain coarser grains and abundant crosscutting metal-sulfide veins. Marvin's pic of the Acapulco thin section shows grains that are coarser than the ones of NWA 1054 but maybe this is a result of the different fields of view: 1.8 cm for NWA 1054 and 1.2 cm for Acapulco Best wishes, Bernd __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Acapulcoites and NWA 725
--- [EMAIL PROTECTED] ha scritto: Unortunately I still don't have a thin section of an acapulcoite but the one pictured in Marvin Killgore's Color Atlas of Meteorites in Thin Section on pages 208-211 (Acapulco) surely looks different than the winonaite on pages 232-235 (NWA 1054). but NWA 1054 is not a winonaite, but a acapulcoite. Matteo M come Meteorite - Matteo Chinellato Via Triestina 126/A - 30030 - TESSERA, VENEZIA, ITALY Email: [EMAIL PROTECTED] Sale Site: http://www.mcomemeteorite.it Collection Site: http://www.mcomemeteorite.info MSN Messanger: spacerocks at hotmail.com EBAY.COM:http://members.ebay.com/aboutme/mcomemeteorite/ ___ Yahoo! Messenger with Voice: chiama da PC a telefono a tariffe esclusive http://it.messenger.yahoo.com __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Acapulcoites and NWA 725
hello this is the official study and analysis http://www.lpi.usra.edu/meetings/lpsc2005/pdf/1808.pdf Matteo --- [EMAIL PROTECTED] ha scritto: Hmm ?!? Just noticed something contradictory: The winonaites are texturally similar to acapulcoites, but the winonaites contain coarser grains and abundant crosscutting metal-sulfide veins. Marvin's pic of the Acapulco thin section shows grains that are coarser than the ones of NWA 1054 but maybe this is a result of the different fields of view: 1.8 cm for NWA 1054 and 1.2 cm for Acapulco Best wishes, Bernd __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list M come Meteorite - Matteo Chinellato Via Triestina 126/A - 30030 - TESSERA, VENEZIA, ITALY Email: [EMAIL PROTECTED] Sale Site: http://www.mcomemeteorite.it Collection Site: http://www.mcomemeteorite.info MSN Messanger: spacerocks at hotmail.com EBAY.COM:http://members.ebay.com/aboutme/mcomemeteorite/ ___ Yahoo! Mail: gratis 1GB per i messaggi e allegati da 10MB http://mail.yahoo.it __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Acapulcoites and NWA 725
http://www.lpi.usra.edu/meetings/lpsc2005/pdf/1808.pdf Matteo, thank you for the link. An interesting detail with regard to NWA 725's status as a winonaite or an acapulcoite might be this conclusion by the authors at the end of the paper: ... the Cr2O3 contents of high-Ca pyroxenes, (1.56 - 1.85 wt. %), are, according to [5], in good agreement with those displayed by acapulcoite meteorites, since winonaites exhibit much lower contents (around 0.2 wt. %). Best wishes, Bernd __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Re: Ad Wanted HB Iron Meteorites
Hi List Just wanted to know if anyone has a Buchwald Handbook of Iron Meteorites for sale? Please email me privately. Mike -- Mike Jensen Jensen Meteorites 16730 E Ada PL Aurora, CO 80017-3137 303-337-4361 IMCA 4264 website: www.jensenmeteorites.com __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Raffle winner? Me neither.
http://www.lpl.arizona.edu/swmc/raffle.html __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list]
WOW!! - Original Message - From: Jim Strope [EMAIL PROTECTED] To: Meteorite-list@meteoritecentral.com Sent: Thursday, February 16, 2006 12:15 PM Subject: Re: [meteorite-list] Transparent Seymchan 23 grams, 82mm by 52mm by 1.5mm thick. http://www.catchafallingstar.com/images/ebay/Seymchan23.JPG Jim Strope 421 Fourth Street Glen Dale, WV 26038 http://www.catchafallingstar.com - Original Message - From: M come Meteorite Meteorites [EMAIL PROTECTED] To: Meteorite-list@meteoritecentral.com Sent: Thursday, February 16, 2006 11:40 AM Subject: Re: [meteorite-list] Why are Esquel slices Transparent Blue? This is my new 2 Seymchan slices, one with olivines, and another with mesosiderite type matrix http://it.geocities.com/mcomemeteoritecollection/Seymchan187.7.JPG http://it.geocities.com/mcomemeteoritecollection/Seymchan63.6.JPG Matteo --- M come Meteorite Meteorites [EMAIL PROTECTED] ha scritto: I have just received 3 fantastic seymchan slices over 150 grams with olivines, later I photograph and I put in my site... Matteo M come Meteorite - Matteo Chinellato Via Triestina 126/A - 30030 - TESSERA, VENEZIA, ITALY Email: [EMAIL PROTECTED] Sale Site: http://www.mcomemeteorite.it Collection Site: http://www.mcomemeteorite.info MSN Messanger: spacerocks at hotmail.com EBAY.COM:http://members.ebay.com/aboutme/mcomemeteorite/ ___ Yahoo! Mail: gratis 1GB per i messaggi e allegati da 10MB http://mail.yahoo.it __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 267.15.9/261 - Release Date: 2/15/2006 __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Acapulcoites and NWA 725
Hmm-ing again :-) The winonaites are texturally similar to acapulcoites, but the winonaites contain coarser grains and abundant crosscutting metal-sulfide veins. Could this by a typo because: Marvin's pic of the Acapulco thin section shows grains that are coarser than the ones of NWA 1054 ... and because: The Antarctic acapulcoite TIL 99002 is mineralogically similar to GRA 98028 but has a larger grain size (300-400 µm) than GRA 98028 (50-100 µm). (Met.Bull. 86, MAPS 37-7, July 2002). .. and now back to Hutchison who states in Table 8.2 on page 252: Grain-size of acapulcoites = 150-230 µm Grain-size of winonaites = 55-230 µm Regards, Bernd __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Mars Rover to Seek Safe Winter Haven
http://www.newscientistspace.com/article.ns?id=dn8730 Mars rover to seek safe winter haven Kimm Groshong New Scientist 16 February 2006 While Spirit busily studies a finely layered outcrop dubbed Home Plate, mission planners say the rover's daily power supply is steadily dropping. And with the Martian winter looming and dust accumulating on Spirit's solar arrays, the team is preparing to drive Spirit to a safe haven. The Martian winter does not officially begin until August, but Byron Jones, rover mission manager at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, California, US, says the team would like to get Spirit situated on a slope called McCool Hill, with its solar arrays tilted northward, in plenty of time. That tilt maximises the sunlight falling on the arrays and worked well for the rovers during their first Martian winter, which peaked in September 2004. Wednesday was Spirit's 754th Martian day (sol) in operation - a sol is 24 hours and 40 minutes. The team estimates it will take about 40 sols for Spirit to trek from Home Plate to McCool Hill and they want to arrive by their 800th sol. We're steadily approaching a point where if we don't reach a northern facing slope, we won't be as productive as we'd like, Jones told New Scientist. Daily toil Jones says in order to be productive during a sol, the rovers need at least 400 watt-hours. That amount of power allows an hour-long drive, a couple hours of robotic arm work or remote sensing and a daily data uplink to the Mars Odyssey spacecraft. To simply stay alive, they need about 280 watt-hours. Spirit is currently operating with about 450 watt-hours per sol, but the available power has dropped by about 100 watt-hours over the past 50 sols, Jones says. Both Spirit and its twin Opportunity have far surpassed the expectations for the mission which began in January 2004 and intended to last 90 days. Principal investigator Steve Squyres, of Cornell University, New York, US, says now that Spirit has reached its long-targeted Home Plate outcrop, the team is collecting data at a furious rate. The extensively layered, semi-circular outcrop is coarsely grained at the bottom with finer grained material higher up. Several theories could explain such layering, Squyres says - it could be a volcanic ash deposit, layers of ejecta from impact cratering or material laid down by wind or water. But he says, If you took a poll of the team right now, I think you would find the favoured hypothesis is that it's some kind of volcanic ash deposit. Volcanic bombs The team is looking for chunks of embedded material, or volcanic bombs, which would provide hints of a volcanic origin. He says before Spirit has to head off towards it winter quarters, the planners hope to manoeuvre the rover on top of Home Plate to gather more data. The coming winter is less pressing for Opportunity, which is closer to the equator and is still operating with about 600 watt-hours of power each sol. Jacob Matijevic, the rover mission team's chief of engineering, also at JPL, said if possible, the team would like Opportunity to winter in Victoria Crater, a large impact crater 2500 to 3000 metres away. That would have the same benefit as we saw in our investigations of Endurance Crater, Matijevic says. The journey to Victoria Crater is likely to take at least three months, he adds. __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Cherry Picked
Is it just me? or is the term Cherry Picked being as misused as the term oriented ?? Ooooh !!! . look at this cherry picked gem : http://cgi.ebay.com/980-GRAM-CHERRY-PICK-CRUSTED-METEORITE-AFRICA-METEOR_W0QQitemZ6606270947QQcategoryZ3239QQrdZ1QQcmdZViewItem Bob __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Acapulcoites and NWA 725
Bernd, I don't mind at all. I think I'm with you wishing I could lean over the 'scope and think Ah, yes, heat and time makes crystals grow and chondrules disappear. Metal migrates and other stuff does too. And thereby progress in an orderly way from chondrites through these primitive achondrites. Unfortunately, it looks like there is more to it than that. In Discrimination of Acapulcoites and Lodranites from Winonaites Rumble et al. state: Combined petrological and oxygen isotopic analyses of five Northwest African primitive achondrites . . . have clarified the relationships among acapulcoites, lodranites and winonaites. It would not be possible to properly classify some specimens in these groups using their mineral compositions alone . . . . http://www.lpi.usra.edu/meetings/metsoc2005/pdf/5138.pdf To say nothing of mere appearances. I don't know what to think about Marvin's NWA 1054 Winonaite. Matteo points out that NWA 1054 is an acapulcoite. Further, I don't see the abundant 120° triple junctions mentioned in the descriptions of NWA 1054. To me it looks a lot like NWA 725 (Tissemoumine). The differences I see under the microscope aren't very subtle. Nor are they orderly. Please see these examples. The fields of view are all the same, three and a half millimeters from left to right. http://www.johnkashuba.com/Ach%20Acapulcoites_and_Winonaites.html Regards, - John John Kashuba Ontario, California - Original Message - From: [EMAIL PROTECTED] To: Meteorite-list@meteoritecentral.com Sent: Thursday, February 16, 2006 11:02 AM Subject: [meteorite-list] Acapulcoites and NWA 725 I'm must be missing something. What could one conclude by comparing thin sections of NWA 725 and a known winonaite? I understand that distinguishing among acapulcoites, lodranites and winonaites is not a textural exercise nor can they be resolved by just their mineral composition. Hello John and List, I thought other list members might also be interested in this thread, so I hope you don't mind me sending this mail to the List as well. No, you are not missing anything. Hand samples of acapulcoites, lodranites and winonaites look pretty much the same tan color (at least to me). Only the micro- scope will reveal their subtle textural differences and only a thin section in polarized light will show mineralogical differences or differences in grain size. Unortunately I still don't have a thin section of an acapulcoite but the one pictured in Marvin Killgore's Color Atlas of Meteorites in Thin Section on pages 208-211 (Acapulco) surely looks different than the winonaite on pages 232-235 (NWA 1054). Something readily noticed is grain-size: The grains in winonaites are usually smaller than in acapulcoites. I know, unfortunately their grain sizes overlap as a comparative overview on p. 252 of Hutchison (Meteorites: A Petrologic, Chemical, and Isotopic Syn- thesis ) shows. To make matters even worse: almost all cited properties overlap :-( Maybe the amount of troilite in NWA 725 could help here. According to Hutchison, acapulcoites have 3-6 vol% FeS whereas winoaites have 1-19 %. The mineral composition of NWA 725 may also be useful in determining whether it is a winonaite or an acapulcoite. Olivine Fo and orthopyroxene En have (slightly) higher values in winonaites, and the same is valid for plagioclase An. Unfortunately both acapulcoites and winonaites can have relict chondrules, so this doesn't help either. But what may help is the fact that winonaites are more depleted in 16-O and so plot closer to the terrestrial fractionation line than acapulcoites. Well, you are right ... a thin section will not disclose such information so I can only repeat what I already mentioned above: grain size and visual appearance of thin sections of winonaites and acapulcoites - they just look different to me and Hutchison also states: The winonaites are texturally similar to acapulcoites, but the winonaites contain coarser grains and abundant crosscutting metal-sulfide veins. So, maybe, the grain size of NWA 725 visible under the microscope does hold a clue ... Cheers, Bernd __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Looking for Nantan Crystals
Hello all I got a request for a large Nantan crystal in the 500 gram to 2 kilo range. Similar to these http://www.nakhladogmeteorites.com/catalog/nantanxls.htm I know there were some that size on the bay a few months back, wish I would have bought them all. If you have a biggun for sale please let me know. Rob Wesel http://www.nakhladogmeteorites.com -- We are the music makers... and we are the dreamers of the dreams. Willy Wonka, 1971 __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] OT: MATTEO money for you!!
Sorry list. La principessa sui piselli - has blocked my address, told you, Matteo. There is a client for you, for whom I should paypal you some bucks. Gimme your paypal-address or I take the money and run. Martin Il Principe vero dei meteoriti __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Cherry Picked
Who is this jackstraw922 guy? I agree with Bob, Cherry Picked Orinated? Looks like the five cent a gram stuff to me. Maybe if he could spell oriented properly we could take him seriously. It is dealers like this that give everybody else a bad name. These look like W6 to me without a sign of metal. Orinated?: http://cgi.ebay.com/280GR-CHERRY-PICK-ORINATED-BLACK-CRUST-METEORITE-AFRICA_W0QQitemZ6606278123QQcategoryZ3239QQrdZ1QQcmdZViewItem Crusted?: http://cgi.ebay.com/980-GRAM-CHERRY-PICK-CRUSTED-METEORITE-AFRICA-METEOR_W0QQitemZ6606270947QQcategoryZ3239QQrdZ1QQcmdZViewItem Give me a break! Adam - Original Message - From: Bob Evans [EMAIL PROTECTED] To: Meteorite-list@meteoritecentral.com Sent: Thursday, February 16, 2006 3:38 PM Subject: [meteorite-list] Cherry Picked Is it just me? or is the term Cherry Picked being as misused as the term oriented ?? Ooooh !!! . look at this cherry picked gem : http://cgi.ebay.com/980-GRAM-CHERRY-PICK-CRUSTED-METEORITE-AFRICA-METEOR_W0QQitemZ6606270947QQcategoryZ3239QQrdZ1QQcmdZViewItem Bob __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Cherry Picked
Hi Bob, No, it's not just you. -Walter - Original Message - From: Bob Evans [EMAIL PROTECTED] To: Meteorite-list@meteoritecentral.com Sent: Thursday, February 16, 2006 6:38 PM Subject: [meteorite-list] Cherry Picked Is it just me? or is the term Cherry Picked being as misused as the term oriented ?? Ooooh !!! . look at this cherry picked gem : http://cgi.ebay.com/980-GRAM-CHERRY-PICK-CRUSTED-METEORITE-AFRICA-METEOR_W0QQitemZ6606270947QQcategoryZ3239QQrdZ1QQcmdZViewItem Bob __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] etchfest 2006
well, anita and i scored some hno3 had etch fever. we had a most embarrasing array of sky iron from social circle, ga, to taza, to gibeon and everything in between. results: gibeon: BEAUTIFUL, silver, aluminum-like etch- taza- SNOWFLAKE etch, sardis, ga KILLER big-crystal silver flashes! social circle- very weak etch- NO etch NEAR TROILITE crystals (troilite was EATEN AWAY and a void left in some areas, but the surrounding iron falied to take an etch). why did some work out and others not? after cautiously handling the smoking nitric, i found that etch was BETTER in more contrated solution- go strong, or go home. when i finally got it right for the gibeons that previously failed to etch AROUND TROILITE crystals, the solution turned dark brown and i had to fish around to find the skyrox (could not see 'em). bottom line: most turned out EXCEPT social circle which refused to etch AROUND troilite crystals eventhough the troilite itself was eaten away a bit??? ANY INSITE / instruction on this edutaining experience would be helpful so that ETCHFEST '07 goes more efficiently. i will be gradually switching over to yahoo mail (it has 100 FREE megs of storage). please cc to: [EMAIL PROTECTED] __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Wanted - Milton Meteorite
Hello List, I'm looking for a slice of the Milton Meteorite of Missouri, U.S.A Please e-mail off list with offers at [EMAIL PROTECTED] Best regards, Tim Heitz __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Cherry Picked
En un mensaje con fecha 02/16/2006 7:47:05 PM Mexico Standard Time, [EMAIL PROTECTED] escribe: Orinated?: Give me a break! Adam Adam, vulgar (sens. common) definition, #1 a break in south Texas (Spanglish dictionary) Saludos, Doug __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Cherry Picked
where is oriented? Matteo --- Bob Evans [EMAIL PROTECTED] ha scritto: Is it just me? or is the term Cherry Picked being as misused as the term oriented ?? Ooooh !!! . look at this cherry picked gem : http://cgi.ebay.com/980-GRAM-CHERRY-PICK-CRUSTED-METEORITE-AFRICA-METEOR_W0QQitemZ6606270947QQcategoryZ3239QQrdZ1QQcmdZViewItem Bob __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list M come Meteorite - Matteo Chinellato Via Triestina 126/A - 30030 - TESSERA, VENEZIA, ITALY Email: [EMAIL PROTECTED] Sale Site: http://www.mcomemeteorite.it Collection Site: http://www.mcomemeteorite.info MSN Messanger: spacerocks at hotmail.com EBAY.COM:http://members.ebay.com/aboutme/mcomemeteorite/ ___ Yahoo! Mail: gratis 1GB per i messaggi e allegati da 10MB http://mail.yahoo.it __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Acapulcoites and NWA 725
Hello NWA 1054 was very affected, and its 100% confirmed is a acapulcoite - many oldest why we have found complete chondrules into - and is paired to nWA 1052, another acapulcoite. The problem is, NWA 1052/1054 have the same matrix of NWA 1058, and this have the same problems of classification why one say its a primitive achondrite like winonaite, another say its a acapulcoite etc...all 3 examples have complete chondrules and not relitic. In only one we have found Melliniite, other 2 notmistery Matteo --- Kashuba, Ontario, California [EMAIL PROTECTED] ha scritto: Bernd, I don't mind at all. I think I'm with you wishing I could lean over the 'scope and think Ah, yes, heat and time makes crystals grow and chondrules disappear. Metal migrates and other stuff does too. And thereby progress in an orderly way from chondrites through these primitive achondrites. Unfortunately, it looks like there is more to it than that. In Discrimination of Acapulcoites and Lodranites from Winonaites Rumble et al. state: Combined petrological and oxygen isotopic analyses of five Northwest African primitive achondrites . . . have clarified the relationships among acapulcoites, lodranites and winonaites. It would not be possible to properly classify some specimens in these groups using their mineral compositions alone . . . . http://www.lpi.usra.edu/meetings/metsoc2005/pdf/5138.pdf To say nothing of mere appearances. I don't know what to think about Marvin's NWA 1054 Winonaite. Matteo points out that NWA 1054 is an acapulcoite. Further, I don't see the abundant 120° triple junctions mentioned in the descriptions of NWA 1054. To me it looks a lot like NWA 725 (Tissemoumine). The differences I see under the microscope aren't very subtle. Nor are they orderly. Please see these examples. The fields of view are all the same, three and a half millimeters from left to right. http://www.johnkashuba.com/Ach%20Acapulcoites_and_Winonaites.html Regards, - John John Kashuba Ontario, California - Original Message - From: [EMAIL PROTECTED] To: Meteorite-list@meteoritecentral.com Sent: Thursday, February 16, 2006 11:02 AM Subject: [meteorite-list] Acapulcoites and NWA 725 I'm must be missing something. What could one conclude by comparing thin sections of NWA 725 and a known winonaite? I understand that distinguishing among acapulcoites, lodranites and winonaites is not a textural exercise nor can they be resolved by just their mineral composition. Hello John and List, I thought other list members might also be interested in this thread, so I hope you don't mind me sending this mail to the List as well. No, you are not missing anything. Hand samples of acapulcoites, lodranites and winonaites look pretty much the same tan color (at least to me). Only the micro- scope will reveal their subtle textural differences and only a thin section in polarized light will show mineralogical differences or differences in grain size. Unortunately I still don't have a thin section of an acapulcoite but the one pictured in Marvin Killgore's Color Atlas of Meteorites in Thin Section on pages 208-211 (Acapulco) surely looks different than the winonaite on pages 232-235 (NWA 1054). Something readily noticed is grain-size: The grains in winonaites are usually smaller than in acapulcoites. I know, unfortunately their grain sizes overlap as a comparative overview on p. 252 of Hutchison (Meteorites: A Petrologic, Chemical, and Isotopic Syn- thesis ) shows. To make matters even worse: almost all cited properties overlap :-( Maybe the amount of troilite in NWA 725 could help here. According to Hutchison, acapulcoites have 3-6 vol% FeS whereas winoaites have 1-19 %. The mineral composition of NWA 725 may also be useful in determining whether it is a winonaite or an acapulcoite. Olivine Fo and orthopyroxene En have (slightly) higher values in winonaites, and the same is valid for plagioclase An. Unfortunately both acapulcoites and winonaites can have relict chondrules, so this doesn't help either. But what may help is the fact that winonaites are more depleted in 16-O and so plot closer to the terrestrial fractionation line than acapulcoites. Well, you are right ... a thin section will not disclose such information so I can only repeat what I already mentioned above: grain size and visual appearance of thin sections of winonaites and acapulcoites - they just look different to me and Hutchison also states: The winonaites are texturally similar to acapulcoites, but the winonaites contain coarser grains and abundant crosscutting metal-sulfide veins. So, maybe, the grain size of NWA 725 visible under the microscope does hold a
Re: [meteorite-list] Acapulcoites and NWA 725 - correct
Hello NWA 1054 was very studied, and its 100% confirmed is a acapulcoite - many oldest why we have found complete chondrules into - and is paired to nWA 1052, another acapulcoite. The problem is, NWA 1052/1054 have the same matrix of NWA 1058, and this have the same problems of classification why one say its a primitive achondrite like winonaite, another say its a acapulcoite etc...all 3 examples have complete chondrules and not relitic. In only one we have found Melliniite, other 2 notmistery Matteo --- Kashuba, Ontario, California [EMAIL PROTECTED] ha scritto: Bernd, I don't mind at all. I think I'm with you wishing I could lean over the 'scope and think Ah, yes, heat and time makes crystals grow and chondrules disappear. Metal migrates and other stuff does too. And thereby progress in an orderly way from chondrites through these primitive achondrites. Unfortunately, it looks like there is more to it than that. In Discrimination of Acapulcoites and Lodranites from Winonaites Rumble et al. state: Combined petrological and oxygen isotopic analyses of five Northwest African primitive achondrites . . . have clarified the relationships among acapulcoites, lodranites and winonaites. It would not be possible to properly classify some specimens in these groups using their mineral compositions alone . . . . http://www.lpi.usra.edu/meetings/metsoc2005/pdf/5138.pdf To say nothing of mere appearances. I don't know what to think about Marvin's NWA 1054 Winonaite. Matteo points out that NWA 1054 is an acapulcoite. Further, I don't see the abundant 120° triple junctions mentioned in the descriptions of NWA 1054. To me it looks a lot like NWA 725 (Tissemoumine). The differences I see under the microscope aren't very subtle. Nor are they orderly. Please see these examples. The fields of view are all the same, three and a half millimeters from left to right. http://www.johnkashuba.com/Ach%20Acapulcoites_and_Winonaites.html Regards, - John John Kashuba Ontario, California - Original Message - From: [EMAIL PROTECTED] To: Meteorite-list@meteoritecentral.com Sent: Thursday, February 16, 2006 11:02 AM Subject: [meteorite-list] Acapulcoites and NWA 725 I'm must be missing something. What could one conclude by comparing thin sections of NWA 725 and a known winonaite? I understand that distinguishing among acapulcoites, lodranites and winonaites is not a textural exercise nor can they be resolved by just their mineral composition. Hello John and List, I thought other list members might also be interested in this thread, so I hope you don't mind me sending this mail to the List as well. No, you are not missing anything. Hand samples of acapulcoites, lodranites and winonaites look pretty much the same tan color (at least to me). Only the micro- scope will reveal their subtle textural differences and only a thin section in polarized light will show mineralogical differences or differences in grain size. Unortunately I still don't have a thin section of an acapulcoite but the one pictured in Marvin Killgore's Color Atlas of Meteorites in Thin Section on pages 208-211 (Acapulco) surely looks different than the winonaite on pages 232-235 (NWA 1054). Something readily noticed is grain-size: The grains in winonaites are usually smaller than in acapulcoites. I know, unfortunately their grain sizes overlap as a comparative overview on p. 252 of Hutchison (Meteorites: A Petrologic, Chemical, and Isotopic Syn- thesis ) shows. To make matters even worse: almost all cited properties overlap :-( Maybe the amount of troilite in NWA 725 could help here. According to Hutchison, acapulcoites have 3-6 vol% FeS whereas winoaites have 1-19 %. The mineral composition of NWA 725 may also be useful in determining whether it is a winonaite or an acapulcoite. Olivine Fo and orthopyroxene En have (slightly) higher values in winonaites, and the same is valid for plagioclase An. Unfortunately both acapulcoites and winonaites can have relict chondrules, so this doesn't help either. But what may help is the fact that winonaites are more depleted in 16-O and so plot closer to the terrestrial fractionation line than acapulcoites. Well, you are right ... a thin section will not disclose such information so I can only repeat what I already mentioned above: grain size and visual appearance of thin sections of winonaites and acapulcoites - they just look different to me and Hutchison also states: The winonaites are texturally similar to acapulcoites, but the winonaites contain coarser grains and abundant crosscutting metal-sulfide veins. So, maybe, the grain size of NWA 725 visible under the microscope does hold a
