[meteorite-list] Meteorite Picture of the Day
Today's Meteorite Picture of the Day: NWA 7876 Contributed by: Jérôme de Creymer http://www.tucsonmeteorites.com/mpod.asp __ 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
Re: [meteorite-list] (House-AD): ORANGE fresh Chelyabinsk (was: Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented!)
Hi AllSvend has an explanation for this brown crust on his excellent websitefrom several years back. http://www.niger-meteorite-recon.de/en/Meteorite_fusion_crust_2.htm Cheers, Graham On Tue, May 28, 2013 at 9:58 PM, Steve Witt stelo...@yahoo.com wrote: Martin, Fred and all, I just got in some of the new meteorite from Mauritania showing the same thing. No black lipping, but brown crust on the back side of a fresh stone. Front: http://www.flickr.com/photos/stevewitt/8870872109/ Back: http://www.flickr.com/photos/stevewitt/8870872297/ Steve Witt IMCA #9020 http://imca.cc/ From: Martin Altmann altm...@meteorite-martin.de To: meteorite-list@meteoritecentral.com Sent: Monday, May 27, 2013 4:03 PM Subject: Re: [meteorite-list] (House-AD): ORANGE fresh Chelyabinsk (was: Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented!) Hi Fred, Exactly and Wow! With your Bensour it seems that just the same had happened! Has also the black rim! My guess at the time I got it, was simply a matter of primary fusion crust (the brownish one) and secondary fusion crust (the darker one). Could it be a matter of altitude where it was formed? Speed temperature of fusion?... There we definitely have to ask our experts of aerodynamics and chemistry here. To me it's evident, because the black crust lips over the brown one, that that brown on the back must have been formed before the crust on the apex. There are going things in flight on the back of the stones remember the Tamdakht-Couscous or the 12.5kg-flat heat-shield, which had also such fragments incorporated in the skin.. Now these color-crusts with Chelyabinsk (and Tissint). Here, look, our most shocking example! Is something for Jan, Menno or Rob, Because half of the stone is almost:ORANGE! Has 63.55g These sides are normal: http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_01.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_02.JPG But look at that! http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_03.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_04.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_05.JPG Hmm, shall we sell it too? O.k :-) Your Meteorite House Von: Meteoriteshow [mailto:meteorites...@free.fr] Gesendet: Montag, 27. Mai 2013 17:32 An: 'Martin Altmann'; meteorite-list@meteoritecentral.com Betreff: RE: [meteorite-list] (House-AD): Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented! Hi All again, It seems that my link didn't work; let me try again, actually I have several pictures: http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/benguerir-7 9.6g(1).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/benguerir-7 9.6g(7).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/benguerir-7 9.6g(6).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/benguerir-7 9.6g(3).jpg Cheers Fred www.meteoriteshow.com IMCA #2491 -Message d'origine- De : meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] De la part de Martin Altmann Envoyé : lundi 27 mai 2013 14:26 À : meteorite-list@meteoritecentral.com Objet : [meteorite-list] (House-AD): Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented! Importance : Haute Hello there, we have to share with you a pretty exciting observation. It was here already on the list, that some of you found on the first-pick Chelyabinskis places with a brownish, nevertheless fresh fusion crust. That phenomenon btw. you had sometimes also on a few Tissints, there the brown crust was even translucent (were horribly difficult to sell, because people watching the photos were skeptical, thought, they wouldn't be fresh, but weathered - and that, where no iron is present in Tissint to rust). Many of you blossomed during the last 3 months into true Chelyabinsk-experts, so please, pay attention to those two individuals and tell us your opinion: 75.45g http://www.meteoritenhaus.de/img/Chelyabinsk_75_45_g_01.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_75_45_g_02.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_75_45_g_03.JPG 68.37g http://www.meteoritenhaus.de/img/Chelyabinsk_68_37_g_01.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_68_37_g_02.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_68_37_g_03.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_68_37_g_04.JPG Well, baffling, aren't they? Both of them have a side, and ONLY one side, which is fully coated by the brown crust, while all other sides are black, as usual. Here: http://www.meteoritenhaus.de/img/Chelyabinsk_68_37_g_02.JPG And here: http://www.meteoritenhaus.de/img/Chelyabinsk_75_45_g_02.JPG And you see, that the brown-side is framed all around by a lipping,
Re: [meteorite-list] (House-AD): ORANGE fresh Chelyabinsk (was: Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented!)
Yes indeed, Graham, one can find tons of infos as well as breathtaking reports on Svend's website. Isn't it fascinating, folks, how much such a stone can tell us not only from his very beginning, but also from his hot ride through the atmosphere? I must confess that I am always anew surprised and excited about that. Best - Matthias - Original Message - From: Graham Ensor graham.en...@gmail.com To: Steve Witt stelo...@yahoo.com Cc: meteorite-list@meteoritecentral.com; Martin Altmann altm...@meteorite-martin.de Sent: Wednesday, May 29, 2013 9:51 AM Subject: Re: [meteorite-list] (House-AD): ORANGE fresh Chelyabinsk (was: Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented!) Hi AllSvend has an explanation for this brown crust on his excellent websitefrom several years back. http://www.niger-meteorite-recon.de/en/Meteorite_fusion_crust_2.htm Cheers, Graham On Tue, May 28, 2013 at 9:58 PM, Steve Witt stelo...@yahoo.com wrote: Martin, Fred and all, I just got in some of the new meteorite from Mauritania showing the same thing. No black lipping, but brown crust on the back side of a fresh stone. Front: http://www.flickr.com/photos/stevewitt/8870872109/ Back: http://www.flickr.com/photos/stevewitt/8870872297/ Steve Witt IMCA #9020 http://imca.cc/ From: Martin Altmann altm...@meteorite-martin.de To: meteorite-list@meteoritecentral.com Sent: Monday, May 27, 2013 4:03 PM Subject: Re: [meteorite-list] (House-AD): ORANGE fresh Chelyabinsk (was: Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented!) Hi Fred, Exactly and Wow! With your Bensour it seems that just the same had happened! Has also the black rim! My guess at the time I got it, was simply a matter of primary fusion crust (the brownish one) and secondary fusion crust (the darker one). Could it be a matter of altitude where it was formed? Speed temperature of fusion?... There we definitely have to ask our experts of aerodynamics and chemistry here. To me it's evident, because the black crust lips over the brown one, that that brown on the back must have been formed before the crust on the apex. There are going things in flight on the back of the stones remember the Tamdakht-Couscous or the 12.5kg-flat heat-shield, which had also such fragments incorporated in the skin.. Now these color-crusts with Chelyabinsk (and Tissint). Here, look, our most shocking example! Is something for Jan, Menno or Rob, Because half of the stone is almost:ORANGE! Has 63.55g These sides are normal: http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_01.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_02.JPG But look at that! http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_03.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_04.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_05.JPG Hmm, shall we sell it too? O.k :-) Your Meteorite House Von: Meteoriteshow [mailto:meteorites...@free.fr] Gesendet: Montag, 27. Mai 2013 17:32 An: 'Martin Altmann'; meteorite-list@meteoritecentral.com Betreff: RE: [meteorite-list] (House-AD): Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented! Hi All again, It seems that my link didn't work; let me try again, actually I have several pictures: http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/benguerir-7 9.6g(1).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/benguerir-7 9.6g(7).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/benguerir-7 9.6g(6).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/benguerir-7 9.6g(3).jpg Cheers Fred www.meteoriteshow.com IMCA #2491 -Message d'origine- De : meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] De la part de Martin Altmann Envoyé : lundi 27 mai 2013 14:26 À : meteorite-list@meteoritecentral.com Objet : [meteorite-list] (House-AD): Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented! Importance : Haute Hello there, we have to share with you a pretty exciting observation. It was here already on the list, that some of you found on the first-pick Chelyabinskis places with a brownish, nevertheless fresh fusion crust. That phenomenon btw. you had sometimes also on a few Tissints, there the brown crust was even translucent (were horribly difficult to sell, because people watching the photos were skeptical, thought, they wouldn't be fresh, but weathered - and that, where no iron is present in Tissint to rust). Many of you blossomed during the last 3 months into true Chelyabinsk-experts, so please, pay attention to those two individuals and tell us your opinion: 75.45g http://www.meteoritenhaus.de/img/Chelyabinsk_75_45_g_01.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_75_45_g_02.JPG
[meteorite-list] ORANGE fresh Chelyabinsk (was: Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented!)
Hi Steve, Fred, all... Marvelous! Now we saw examples of Bensour, Mauretania, Chelyabinsk and have from old literature Pultusk and Mocs.. ...seems that Captain Blood's Orientata needs a new chapter: Color-Orientation! (Fascinating, after such a long time spent with meteorites, we from the Meteorite House weren't aware of that phenomenon, you always can learn something new!). Though we have to have some discipline and to be cautious, not to establish a new artificial hype or to create a new fashion, multiplying the prices, as it had happened, if you remember, first with the hammers, then with the meteorites with holes and again afterwards with the irons with impact craters. At least now the Ensisheim visitor have an additional hint, what to look for, if they'll rummage the tables of the Russian colleagues, which will sag from the loads of fantastic Chelyabinsk individuals. Cheers! Meteorite House On Tue, May 28, 2013 at 9:58 PM, Steve Witt stelo...@yahoo.com wrote: Martin, Fred and all, I just got in some of the new meteorite from Mauritania showing the same thing. No black lipping, but brown crust on the back side of a fresh stone. Front: http://www.flickr.com/photos/stevewitt/8870872109/ Back: http://www.flickr.com/photos/stevewitt/8870872297/ Steve Witt IMCA #9020 http://imca.cc/ From: Martin Altmann altm...@meteorite-martin.de To: meteorite-list@meteoritecentral.com Sent: Monday, May 27, 2013 4:03 PM Subject: Re: [meteorite-list] (House-AD): ORANGE fresh Chelyabinsk (was: Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented!) Hi Fred, Exactly and Wow! With your Bensour it seems that just the same had happened! Has also the black rim! My guess at the time I got it, was simply a matter of primary fusion crust (the brownish one) and secondary fusion crust (the darker one). Could it be a matter of altitude where it was formed? Speed temperature of fusion?... There we definitely have to ask our experts of aerodynamics and chemistry here. To me it's evident, because the black crust lips over the brown one, that that brown on the back must have been formed before the crust on the apex. There are going things in flight on the back of the stones remember the Tamdakht-Couscous or the 12.5kg-flat heat-shield, which had also such fragments incorporated in the skin.. Now these color-crusts with Chelyabinsk (and Tissint). Here, look, our most shocking example! Is something for Jan, Menno or Rob, Because half of the stone is almost:ORANGE! Has 63.55g These sides are normal: http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_01.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_02.JPG But look at that! http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_03.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_04.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_05.JPG Hmm, shall we sell it too? O.k :-) Your Meteorite House Von: Meteoriteshow [mailto:meteorites...@free.fr] Gesendet: Montag, 27. Mai 2013 17:32 An: 'Martin Altmann'; meteorite-list@meteoritecentral.com Betreff: RE: [meteorite-list] (House-AD): Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented! Hi All again, It seems that my link didn't work; let me try again, actually I have several pictures: http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/bengu erir-7 9.6g(1).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/bengu erir-7 9.6g(7).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/bengu erir-7 9.6g(6).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/bengu erir-7 9.6g(3).jpg Cheers Fred www.meteoriteshow.com IMCA #2491 -Message d'origine- De : meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] De la part de Martin Altmann Envoyé : lundi 27 mai 2013 14:26 À : meteorite-list@meteoritecentral.com Objet : [meteorite-list] (House-AD): Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented! Importance : Haute Hello there, we have to share with you a pretty exciting observation. It was here already on the list, that some of you found on the first-pick Chelyabinskis places with a brownish, nevertheless fresh fusion crust. That phenomenon btw. you had sometimes also on a few Tissints, there the brown crust was even translucent (were horribly difficult to sell, because people watching the photos were skeptical, thought, they wouldn't be fresh, but weathered - and that, where no iron is present in Tissint to rust). Many of you blossomed during the last 3 months into true Chelyabinsk-experts, so please, pay attention to those two individuals and tell us your opinion: 75.45g http://www.meteoritenhaus.de/img/Chelyabinsk_75_45_g_01.JPG
[meteorite-list] Red(dish) Fusion Crust
Hello All, And the red crust isn't just found on trailing faces of stones: http://www.ebay.com/itm/meteorite-Chelyabinsk-chondrite-LL5-complete-stone-14-65-g-recent-fall-Russia-/161029553312?pt=LH_DefaultDomain_0hash=item257e1bfca0nma=truesi=jHrsL50utK2qqpfbNFqr9%252BcmQSM%253Dorig_cvip=truert=nc_trksid=p2047675.l2557 It's been seen on stones from just about every reasonably-sized L and LL multiple-stone fall I can think of, and has been discussed on the list as far back as 2007, if not earlier. Similar stones have been noted from Breja, Bensour, Battle Mountain, Ash Creek, Mifflin, etc. This list seems to have a short memory. For those who are curious, magnetite content is a bit vague. The difference in fusion crust coloration is most likely caused by the oxidative state of the iron in the fusion crust. http://en.wikipedia.org/wiki/Iron_oxide If we assume that water is not abundant in the fusion crust due to the high heat necessary to form a fusion crust (perhaps wrong, but simplifies things), we have three oxides to work with: -- From above: Wüstite (FeO) is a mineral form of iron (II) oxide found with meteorites and native iron. *It has a gray color with a greenish tint in reflected light.* Magnetite is a mineral, one of the two common naturally occurring iron oxides (chemical formula Fe3O4). Magnetite has been very important in understanding the conditions under which rocks form. Magnetite reacts with oxygen to produce hematite, and the mineral pair forms a buffer that can control oxygen fugacity. *Generally black or silvery, can have a brownish tint.* Iron (III) oxide or ferric oxide is the inorganic compound with the formula Fe2O3. We'd most likely be dealing with alpha-phase ferric oxide because it is the most stable Fe2O3 phase over ~500°C. This one's also called hematite. *Fe2O3 is dark red.* -- The wikipedia page above links to nice summaries of the hydrous oxides as well, if you want to check them out. The variables we have to work with are: the amount of iron in the meteorite, plus abundances of other minerals that could affect oxide or other mineral formation in the crust. Fragment shape and orientation probably control oxygen flow to given areas (see link below) but also -- ...the entry speed/angle and breakup height would probably help to determine the rate of ablation/deceleration of given fragments (e.g. the point at which fusion crust will remain on the surface of the meteorite versus ablating away), which would also affect the temperature at which the remaining fusion crust formed (a potential variable controlling the oxidative state of iron?). Either way, since access to oxygen seems to determine the redness of the fusion crust, altitude of fragmentation is probably quite important. http://www.ebay.com/itm/Chelyabinsk-Meteorite-Fall-from-Feb-15th-2013-in-Russia-7-098-grams-/111073775576?pt=LH_DefaultDomain_0hash=item19dc834fd8 ^One of the better examples currently on ebay, with topographically low areas that clearly show reddening/browning. In short, yes, hematite is red, so hematite content is a good candidate for the 'reddening agent.' But, then...why don't H chondrites usually form such red fusion crusts? It might be due to the higher iron content in H-chondrites and the ratio of iron to oxygen in the above three oxides. Fe2O3 (hematite) has the lowest Fe to O ratio of the above three minerals (1:1 vs. 3:4 vs. 2:3), so a meteorite that is higher in iron might be less likely to form a lower-iron oxide (hematite) in the same conditions. But this seems somewhat unlikely, as this hypothesized cutoff for hematite formation in the crust would depend on the difference in the modal abundance of Fe in L's versus H's, and that's not a clear boundary. One would have to look at the metal content of various larger multiple falls and examine large numbers of pristine stones from each in order to reach a well-supported answer to that question. Chelyabinsk does support this general hypothesis, though. It broke up at a lower altitude than most bolides do, so fragments should have been exposed to a thicker atmosphere/more oxygen in their final ablative stages of flight. Because of this, we'd expect to see more iron oxides with higher ratios of oxygen to iron in the fusion crust (e.g. our red hematite) . Lo and behold, we're seeing more stones with reddish fusion crusts than usual. This could be a coincidence, but...perhaps not. One should also note that many Chelyabinsks aren't just black or reddish. Many are an unusual lighter brown/grey color: http://www.ebay.com/itm/meteorite-Chelyabinsk-chondrite-LL5-complete-stone-13-14-g-recent-fall-Russia-/161034404036?pt=LH_DefaultDomain_0hash=item257e6600c4 That's a color I've never seen before on an OC, but many Chelyabinsks show it. Could higher levels of (grey/metallic) magnetite be the cause? I wonder...and if that's the case, I'd be curious to know why this is specifically happening with Chelyabinsk
[meteorite-list] Sikhote Alin
Dear List, Does anyone have a very aesthetic, nicely regmaglypted Sikhote Alin they'd like to sell? Please let me know off list. Thanks, El __ 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
Re: [meteorite-list] Red(dish) Fusion Crust
This is seen on many stones, I have a Bensour that is almost red. I have many Chelyabinsk stones also with brown to red crust, and some iridescent in every color in the rainbow. This is seen in many L and LL falls, but generally only before exposure to water. However I found my first Chelyabinsk which was 503 grams, perfect pyramid with one red crusted side, all other sides extremely black. Michael Farmer Sent from my iPad On May 29, 2013, at 8:00 AM, Jason Utas meteorite...@gmail.com wrote: Hello All, And the red crust isn't just found on trailing faces of stones: http://www.ebay.com/itm/meteorite-Chelyabinsk-chondrite-LL5-complete-stone-14-65-g-recent-fall-Russia-/161029553312?pt=LH_DefaultDomain_0hash=item257e1bfca0nma=truesi=jHrsL50utK2qqpfbNFqr9%252BcmQSM%253Dorig_cvip=truert=nc_trksid=p2047675.l2557 It's been seen on stones from just about every reasonably-sized L and LL multiple-stone fall I can think of, and has been discussed on the list as far back as 2007, if not earlier. Similar stones have been noted from Breja, Bensour, Battle Mountain, Ash Creek, Mifflin, etc. This list seems to have a short memory. For those who are curious, magnetite content is a bit vague. The difference in fusion crust coloration is most likely caused by the oxidative state of the iron in the fusion crust. http://en.wikipedia.org/wiki/Iron_oxide If we assume that water is not abundant in the fusion crust due to the high heat necessary to form a fusion crust (perhaps wrong, but simplifies things), we have three oxides to work with: -- From above: Wüstite (FeO) is a mineral form of iron (II) oxide found with meteorites and native iron. *It has a gray color with a greenish tint in reflected light.* Magnetite is a mineral, one of the two common naturally occurring iron oxides (chemical formula Fe3O4). Magnetite has been very important in understanding the conditions under which rocks form. Magnetite reacts with oxygen to produce hematite, and the mineral pair forms a buffer that can control oxygen fugacity. *Generally black or silvery, can have a brownish tint.* Iron (III) oxide or ferric oxide is the inorganic compound with the formula Fe2O3. We'd most likely be dealing with alpha-phase ferric oxide because it is the most stable Fe2O3 phase over ~500°C. This one's also called hematite. *Fe2O3 is dark red.* -- The wikipedia page above links to nice summaries of the hydrous oxides as well, if you want to check them out. The variables we have to work with are: the amount of iron in the meteorite, plus abundances of other minerals that could affect oxide or other mineral formation in the crust. Fragment shape and orientation probably control oxygen flow to given areas (see link below) but also -- ...the entry speed/angle and breakup height would probably help to determine the rate of ablation/deceleration of given fragments (e.g. the point at which fusion crust will remain on the surface of the meteorite versus ablating away), which would also affect the temperature at which the remaining fusion crust formed (a potential variable controlling the oxidative state of iron?). Either way, since access to oxygen seems to determine the redness of the fusion crust, altitude of fragmentation is probably quite important. http://www.ebay.com/itm/Chelyabinsk-Meteorite-Fall-from-Feb-15th-2013-in-Russia-7-098-grams-/111073775576?pt=LH_DefaultDomain_0hash=item19dc834fd8 ^One of the better examples currently on ebay, with topographically low areas that clearly show reddening/browning. In short, yes, hematite is red, so hematite content is a good candidate for the 'reddening agent.' But, then...why don't H chondrites usually form such red fusion crusts? It might be due to the higher iron content in H-chondrites and the ratio of iron to oxygen in the above three oxides. Fe2O3 (hematite) has the lowest Fe to O ratio of the above three minerals (1:1 vs. 3:4 vs. 2:3), so a meteorite that is higher in iron might be less likely to form a lower-iron oxide (hematite) in the same conditions. But this seems somewhat unlikely, as this hypothesized cutoff for hematite formation in the crust would depend on the difference in the modal abundance of Fe in L's versus H's, and that's not a clear boundary. One would have to look at the metal content of various larger multiple falls and examine large numbers of pristine stones from each in order to reach a well-supported answer to that question. Chelyabinsk does support this general hypothesis, though. It broke up at a lower altitude than most bolides do, so fragments should have been exposed to a thicker atmosphere/more oxygen in their final ablative stages of flight. Because of this, we'd expect to see more iron oxides with higher ratios of oxygen to iron in the fusion crust (e.g. our red hematite) . Lo and behold, we're seeing more stones with reddish fusion crusts than
Re: [meteorite-list] ORANGE fresh Chelyabinsk (was: Two specialChelyabinsk individualswith Brown Lee-side Crust - color-oriented!)
Hi Martin, Steve, all... Let's call them chocolate coffee fusion crusted meteorites! Cheers Fred -Message d'origine- De : meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] De la part de Martin Altmann Envoyé : mercredi 29 mai 2013 13:35 À : meteorite-list@meteoritecentral.com Objet : [meteorite-list] ORANGE fresh Chelyabinsk (was: Two specialChelyabinsk individualswith Brown Lee-side Crust - color-oriented!) Hi Steve, Fred, all... Marvelous! Now we saw examples of Bensour, Mauretania, Chelyabinsk and have from old literature Pultusk and Mocs.. ...seems that Captain Blood's Orientata needs a new chapter: Color-Orientation! (Fascinating, after such a long time spent with meteorites, we from the Meteorite House weren't aware of that phenomenon, you always can learn something new!). Though we have to have some discipline and to be cautious, not to establish a new artificial hype or to create a new fashion, multiplying the prices, as it had happened, if you remember, first with the hammers, then with the meteorites with holes and again afterwards with the irons with impact craters. At least now the Ensisheim visitor have an additional hint, what to look for, if they'll rummage the tables of the Russian colleagues, which will sag from the loads of fantastic Chelyabinsk individuals. Cheers! Meteorite House On Tue, May 28, 2013 at 9:58 PM, Steve Witt stelo...@yahoo.com wrote: Martin, Fred and all, I just got in some of the new meteorite from Mauritania showing the same thing. No black lipping, but brown crust on the back side of a fresh stone. Front: http://www.flickr.com/photos/stevewitt/8870872109/ Back: http://www.flickr.com/photos/stevewitt/8870872297/ Steve Witt IMCA #9020 http://imca.cc/ From: Martin Altmann altm...@meteorite-martin.de To: meteorite-list@meteoritecentral.com Sent: Monday, May 27, 2013 4:03 PM Subject: Re: [meteorite-list] (House-AD): ORANGE fresh Chelyabinsk (was: Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented!) Hi Fred, Exactly and Wow! With your Bensour it seems that just the same had happened! Has also the black rim! My guess at the time I got it, was simply a matter of primary fusion crust (the brownish one) and secondary fusion crust (the darker one). Could it be a matter of altitude where it was formed? Speed temperature of fusion?... There we definitely have to ask our experts of aerodynamics and chemistry here. To me it's evident, because the black crust lips over the brown one, that that brown on the back must have been formed before the crust on the apex. There are going things in flight on the back of the stones remember the Tamdakht-Couscous or the 12.5kg-flat heat-shield, which had also such fragments incorporated in the skin.. Now these color-crusts with Chelyabinsk (and Tissint). Here, look, our most shocking example! Is something for Jan, Menno or Rob, Because half of the stone is almost:ORANGE! Has 63.55g These sides are normal: http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_01.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_02.JPG But look at that! http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_03.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_04.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_05.JPG Hmm, shall we sell it too? O.k :-) Your Meteorite House Von: Meteoriteshow [mailto:meteorites...@free.fr] Gesendet: Montag, 27. Mai 2013 17:32 An: 'Martin Altmann'; meteorite-list@meteoritecentral.com Betreff: RE: [meteorite-list] (House-AD): Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented! Hi All again, It seems that my link didn't work; let me try again, actually I have several pictures: http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/bengu erir-7 9.6g(1).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/bengu erir-7 9.6g(7).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/bengu erir-7 9.6g(6).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/bengu erir-7 9.6g(3).jpg Cheers Fred www.meteoriteshow.com IMCA #2491 -Message d'origine- De : meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] De la part de Martin Altmann Envoyé : lundi 27 mai 2013 14:26 À : meteorite-list@meteoritecentral.com Objet : [meteorite-list] (House-AD): Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented! Importance : Haute Hello there, we have to share with you a pretty exciting observation. It was here already on the list, that some of you found on the first-pick Chelyabinskis places with a brownish, nevertheless fresh fusion crust. That phenomenon btw. you had sometimes also on a few Tissints,
Re: [meteorite-list] Red(dish) Fusion Crust
Hi, But, then...why don't H chondrites usually form such red fusion crusts? But they do, the example on Svend's page is a Buzzard Coulee, and in literature you read it about Pultusk. This list seems to have a short memory. Well, the specialty here, is that a colour variation in the crust, if found only on one side, can be used as criterion for orientation. Most of the examples shown here, underline, that stones must have had at least a longer phase of stable flight, because it is indicated by the lipping around the edges of these sides. (Which identify the coloured sides as backsides). Best, Martin __ 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
Re: [meteorite-list] Red(dish) Fusion Crust
Hola, Looking at his pagethe Buzzard is red to a much lesser extent. Good observation, though -- it makes sense that H's would still show at least some hematite presence, if that is was causes the red coloration. The first link in my last email goes against what you say above. Note that the pictured stone has a black, frothy rear and a reddish shield-shaped front. Regards, Jason www.fallsandfinds.com On Wed, May 29, 2013 at 8:41 AM, Martin Altmann altm...@meteorite-martin.de wrote: Hi, But, then...why don't H chondrites usually form such red fusion crusts? But they do, the example on Svend's page is a Buzzard Coulee, and in literature you read it about Pultusk. This list seems to have a short memory. Well, the specialty here, is that a colour variation in the crust, if found only on one side, can be used as criterion for orientation. Most of the examples shown here, underline, that stones must have had at least a longer phase of stable flight, because it is indicated by the lipping around the edges of these sides. (Which identify the coloured sides as backsides). Best, Martin __ 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 __ 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
Re: [meteorite-list] Red(dish) Fusion Crust
Hiho, I'm thrilled, maybe now many readers of the list rush to their drawers and showcases, to look for more examples of other falls, where they thought before, that the lighter colour was due terrestrial oxidation and the individuals not that fresh. Let's wait, what they'll find! Martin -Ursprüngliche Nachricht- Von: Jason Utas [mailto:meteorite...@gmail.com] Gesendet: Mittwoch, 29. Mai 2013 18:02 An: Martin Altmann Betreff: Re: [meteorite-list] Red(dish) Fusion Crust Hola, Looking at his pagethe Buzzard is red to a much lesser extent. Good observation, though -- it makes sense that H's would still show at least some hematite presence, if that is was causes the red coloration. The first link in my last email goes against what you say above. Note that the pictured stone has a black, frothy rear and a reddish shield-shaped front. Regards, Jason www.fallsandfinds.com On Wed, May 29, 2013 at 8:41 AM, Martin Altmann altm...@meteorite-martin.de wrote: Hi, But, then...why don't H chondrites usually form such red fusion crusts? But they do, the example on Svend's page is a Buzzard Coulee, and in literature you read it about Pultusk. This list seems to have a short memory. Well, the specialty here, is that a colour variation in the crust, if found only on one side, can be used as criterion for orientation. Most of the examples shown here, underline, that stones must have had at least a longer phase of stable flight, because it is indicated by the lipping around the edges of these sides. (Which identify the coloured sides as backsides). Best, Martin __ 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 __ 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] Met Bulletin Update - Indian Butte Fall, Vestans, Type-3's
Hi Bulletin Watchers, There are several new approvals. Most of them are meteorites from various deserts (NWA, Chile, etc). One is the Indian Butte Arizona fall of 1998. There are also several Vestans and type-3 finds newly approved. Link - http://www.lpi.usra.edu/meteor/metbull.php?sea=sfor=namesants=falls=valids=stype=containslrec=50map=gebrowse=country=Allsrt=namecateg=Allmblist=Allrect=phot=snew=1pnt=Normal%20tabledr=page=0 From the Indian Butte write-up : Indian Butte32°51.860’N, 112°2.920’W Pinal County, Arizona, USA Fell: 7 June 1998 Classification: Ordinary chondrite (H5) History: The following lines of evidence support a connection between the Indian Butte stones and the Casa Grande fireball of 7 June 1998: 1) The discovery location is consistent with the triangulated endpoint based on fireball reports; 2) The location is directly under a Doppler radar return; 3) The stones are fresh (weathering grade W0 to 1). Doppler radar was first used in 2009 to locate the Ash Creek meteorite fall. The Indian Butte radar signal was recently identified during a search of historic falls. Some stones have been marketed under the synonym Stanfield. A 128 gram stone was discovered by Robert Reisener, Sonny Clary, and Fredric Stephan while investigating a doppler radar signal corresponding to the Casa Grande fireball of 7 June 1998. At least 30 other stones were subsequently found. The Doppler signature was identified by Marc Fries and Robert Matson using fireball witness reports collected by Robert Ward. The location of discovery is near the area searched by David Kring and others immediately after the fireball. Physical characteristics: At least 30 fusion-crusted stones have been recovered, with a total mass of 1721 grams. The fusion crust is fresh, although many stones display slight oxidation on the bottom where they lay on the desert surface. The interior metal is free of limonite rinds, indicative of weathering grade W0. Petrography: (A.Rubin, UCLA) The chondrite is moderately recrystallized. Polysynthetically twinned low-Ca pyroxene is absent. A few small grains of diopside have grown large enough to be analyzed with the electron microprobe. Plagioclase has also grown fairly coarse; grains up to 25 µm across are present. Geochemistry: Olivine, Fa17.9±0.3; pyroxene, Fs16.0±0.2Wo1.5±0.2. Mineralogical equilibrium has occurred. Classification: Ordinary chondrite (H5). Shock stage = S1 and weathering grade = W0. Specimens: Most stones are privately held; 22.2 grams have been deposited at UCLA. Best regards and happy huntings, MikeG -- - Web - http://www.galactic-stone.com Facebook - http://www.facebook.com/galacticstone Twitter - http://twitter.com/GalacticStone Pinterest - http://pinterest.com/galacticstone RSS - http://www.galactic-stone.com/rss/126516 - __ 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] NASA Hosts News and Social Media Events Around This Week's Asteroid Pass
May 29, 2013 Sarah Ramsey Headquarters, Washington 202-358-1694 sarah.ram...@nasa.gov MEDIA ADVISORY: M13-086 NASA HOSTS NEWS AND SOCIAL MEDIA EVENTS AROUND THIS WEEK'S ASTEROID PASS WASHINGTON -- NASA is inviting members of the media and public to participate in online and television events May 30-31 with NASA officials and experts discussing the agency's asteroid initiative and the Earth flyby of the 1.7-mile-long asteroid 1998 QE2. At 4:59 p.m. EDT, Friday, May 31, 1998 QE2 will pass by Earth at a safe distance of about 3.6 million miles -- its closest approach for at least the next two centuries. The asteroid was discovered Aug. 19, 1998, by the Massachusetts Institute of Technology's Lincoln Near Earth Asteroid Research Program near Socorro, N.M. The schedule of events is: Thursday, May 30 -- 1:30-2:30 p.m.: NASA's Jet Propulsion Laboratory (JPL) in Pasadena, Calif., will show on NASA Television live telescope images of the asteroid and host a discussion with NASA Administrator Charles Bolden and experts from JPL and the Goldstone Deep Space Communications Complex. Scientists at Goldstone will be using radar to track and image the asteroid. The event also will be streamed live on the agency's website at: http://www.nasa.gov/ntv The event also will be available on Ustream.tv with live chat capability at: http://www.ustream.tv/nasajpl2 Viewers may submit questions in advance to @AsteroidWatch on Twitter with the hashtag #asteroidQE2. -- 8-10 p.m.: Bill Cooke of the Meteoroid Environment Office at NASA's Marshall Space Flight Center in Huntsville, Ala., will host an online chat at: http://www.nasa.gov/chat Friday, May 31 -- 2-3 p.m., NASA Deputy Administrator Lori Garver will participate in a White House We the Geeks Google+ Hangout. Participants will discuss asteroid identification, characterization, resource utilization, and hazard mitigation. The hangout can be viewed at the White House website at: https://plus.google.com/+whitehouse/posts NASA recently announced plans to find, study, capture and relocate an asteroid for exploration by astronauts. The asteroid initiative is a strategy to leverage human and robotic activities for the first human mission while accelerating efforts to improve detection and characterization of asteroids. For more about NASA's asteroid activities, visit: http://www.nasa.gov/asteroid -end- __ 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
Re: [meteorite-list] Red(dish) Fusion Crust
Same as I thought perhaps oxidation on one side of this bensour but now I learn otherwise: http://www.johnsonmeteorites.com/BENSOUR.html Johnson, M.D. www.johnsonmeteorites.com Thumbed on my iPhone On May 29, 2013, at 12:14 PM, Martin Altmann altm...@meteorite-martin.de wrote: Hiho, I'm thrilled, maybe now many readers of the list rush to their drawers and showcases, to look for more examples of other falls, where they thought before, that the lighter colour was due terrestrial oxidation and the individuals not that fresh. Let's wait, what they'll find! Martin -Ursprüngliche Nachricht- Von: Jason Utas [mailto:meteorite...@gmail.com] Gesendet: Mittwoch, 29. Mai 2013 18:02 An: Martin Altmann Betreff: Re: [meteorite-list] Red(dish) Fusion Crust Hola, Looking at his pagethe Buzzard is red to a much lesser extent. Good observation, though -- it makes sense that H's would still show at least some hematite presence, if that is was causes the red coloration. The first link in my last email goes against what you say above. Note that the pictured stone has a black, frothy rear and a reddish shield-shaped front. Regards, Jason www.fallsandfinds.com On Wed, May 29, 2013 at 8:41 AM, Martin Altmann altm...@meteorite-martin.de wrote: Hi, But, then...why don't H chondrites usually form such red fusion crusts? But they do, the example on Svend's page is a Buzzard Coulee, and in literature you read it about Pultusk. This list seems to have a short memory. Well, the specialty here, is that a colour variation in the crust, if found only on one side, can be used as criterion for orientation. Most of the examples shown here, underline, that stones must have had at least a longer phase of stable flight, because it is indicated by the lipping around the edges of these sides. (Which identify the coloured sides as backsides). Best, Martin __ 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 __ 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 __ 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
Re: [meteorite-list] ORANGE fresh Chelyabinsk (was: Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented!)
Hi MartinSvend beat us too it on his wonderful website ages agosee here for his explanation. http://www.niger-meteorite-recon.de/en/Meteorite_fusion_crust_2.htm Look forward to seeing you in Ensisheim. Graham On Wed, May 29, 2013 at 12:34 PM, Martin Altmann altm...@meteorite-martin.de wrote: Hi Steve, Fred, all... Marvelous! Now we saw examples of Bensour, Mauretania, Chelyabinsk and have from old literature Pultusk and Mocs.. ...seems that Captain Blood's Orientata needs a new chapter: Color-Orientation! (Fascinating, after such a long time spent with meteorites, we from the Meteorite House weren't aware of that phenomenon, you always can learn something new!). Though we have to have some discipline and to be cautious, not to establish a new artificial hype or to create a new fashion, multiplying the prices, as it had happened, if you remember, first with the hammers, then with the meteorites with holes and again afterwards with the irons with impact craters. At least now the Ensisheim visitor have an additional hint, what to look for, if they'll rummage the tables of the Russian colleagues, which will sag from the loads of fantastic Chelyabinsk individuals. Cheers! Meteorite House On Tue, May 28, 2013 at 9:58 PM, Steve Witt stelo...@yahoo.com wrote: Martin, Fred and all, I just got in some of the new meteorite from Mauritania showing the same thing. No black lipping, but brown crust on the back side of a fresh stone. Front: http://www.flickr.com/photos/stevewitt/8870872109/ Back: http://www.flickr.com/photos/stevewitt/8870872297/ Steve Witt IMCA #9020 http://imca.cc/ From: Martin Altmann altm...@meteorite-martin.de To: meteorite-list@meteoritecentral.com Sent: Monday, May 27, 2013 4:03 PM Subject: Re: [meteorite-list] (House-AD): ORANGE fresh Chelyabinsk (was: Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented!) Hi Fred, Exactly and Wow! With your Bensour it seems that just the same had happened! Has also the black rim! My guess at the time I got it, was simply a matter of primary fusion crust (the brownish one) and secondary fusion crust (the darker one). Could it be a matter of altitude where it was formed? Speed temperature of fusion?... There we definitely have to ask our experts of aerodynamics and chemistry here. To me it's evident, because the black crust lips over the brown one, that that brown on the back must have been formed before the crust on the apex. There are going things in flight on the back of the stones remember the Tamdakht-Couscous or the 12.5kg-flat heat-shield, which had also such fragments incorporated in the skin.. Now these color-crusts with Chelyabinsk (and Tissint). Here, look, our most shocking example! Is something for Jan, Menno or Rob, Because half of the stone is almost:ORANGE! Has 63.55g These sides are normal: http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_01.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_02.JPG But look at that! http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_03.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_04.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_05.JPG Hmm, shall we sell it too? O.k :-) Your Meteorite House Von: Meteoriteshow [mailto:meteorites...@free.fr] Gesendet: Montag, 27. Mai 2013 17:32 An: 'Martin Altmann'; meteorite-list@meteoritecentral.com Betreff: RE: [meteorite-list] (House-AD): Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented! Hi All again, It seems that my link didn't work; let me try again, actually I have several pictures: http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/bengu erir-7 9.6g(1).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/bengu erir-7 9.6g(7).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/bengu erir-7 9.6g(6).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/bengu erir-7 9.6g(3).jpg Cheers Fred www.meteoriteshow.com IMCA #2491 -Message d'origine- De : meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] De la part de Martin Altmann Envoyé : lundi 27 mai 2013 14:26 À : meteorite-list@meteoritecentral.com Objet : [meteorite-list] (House-AD): Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented! Importance : Haute Hello there, we have to share with you a pretty exciting observation. It was here already on the list, that some of you found on the first-pick Chelyabinskis places with a brownish, nevertheless fresh fusion crust. That phenomenon btw. you had sometimes also on a few Tissints, there the brown crust was even translucent (were horribly difficult to sell, because people watching the photos were skeptical, thought, they wouldn't be fresh,
Re: [meteorite-list] ORANGE fresh Chelyabinsk (was: Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented!)
I will take a SWAG (Scientific Wild Ass Guess) at the color differential. I know when I was having a glass blower prepare NWA 482 pendants that some of the material would turn red. He was exposing material to the oxidizing part of the flame and not the reducing part. We corrected the problem after analyzing the situation. When a meteoroid enters the atmosphere, the plasma might be more oxidizing on the trailing edge. Adam From: Graham Ensor graham.en...@gmail.com To: Martin Altmann altm...@meteorite-martin.de Cc: meteorite list meteorite-list@meteoritecentral.com Sent: Wednesday, May 29, 2013 11:35 AM Subject: Re: [meteorite-list] ORANGE fresh Chelyabinsk (was: Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented!) Hi MartinSvend beat us too it on his wonderful website ages agosee here for his explanation. http://www.niger-meteorite-recon.de/en/Meteorite_fusion_crust_2.htm Look forward to seeing you in Ensisheim. Graham On Wed, May 29, 2013 at 12:34 PM, Martin Altmann altm...@meteorite-martin.de wrote: Hi Steve, Fred, all... Marvelous! Now we saw examples of Bensour, Mauretania, Chelyabinsk and have from old literature Pultusk and Mocs.. ...seems that Captain Blood's Orientata needs a new chapter: Color-Orientation! (Fascinating, after such a long time spent with meteorites, we from the Meteorite House weren't aware of that phenomenon, you always can learn something new!). Though we have to have some discipline and to be cautious, not to establish a new artificial hype or to create a new fashion, multiplying the prices, as it had happened, if you remember, first with the hammers, then with the meteorites with holes and again afterwards with the irons with impact craters. At least now the Ensisheim visitor have an additional hint, what to look for, if they'll rummage the tables of the Russian colleagues, which will sag from the loads of fantastic Chelyabinsk individuals. Cheers! Meteorite House On Tue, May 28, 2013 at 9:58 PM, Steve Witt stelo...@yahoo.com wrote: Martin, Fred and all, I just got in some of the new meteorite from Mauritania showing the same thing. No black lipping, but brown crust on the back side of a fresh stone. Front: http://www.flickr.com/photos/stevewitt/8870872109/ Back: http://www.flickr.com/photos/stevewitt/8870872297/ Steve Witt IMCA #9020 http://imca.cc/ From: Martin Altmann altm...@meteorite-martin.de To: meteorite-list@meteoritecentral.com Sent: Monday, May 27, 2013 4:03 PM Subject: Re: [meteorite-list] (House-AD): ORANGE fresh Chelyabinsk (was: Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented!) Hi Fred, Exactly and Wow! With your Bensour it seems that just the same had happened! Has also the black rim! My guess at the time I got it, was simply a matter of primary fusion crust (the brownish one) and secondary fusion crust (the darker one). Could it be a matter of altitude where it was formed? Speed temperature of fusion?... There we definitely have to ask our experts of aerodynamics and chemistry here. To me it's evident, because the black crust lips over the brown one, that that brown on the back must have been formed before the crust on the apex. There are going things in flight on the back of the stones remember the Tamdakht-Couscous or the 12.5kg-flat heat-shield, which had also such fragments incorporated in the skin.. Now these color-crusts with Chelyabinsk (and Tissint). Here, look, our most shocking example! Is something for Jan, Menno or Rob, Because half of the stone is almost: ORANGE! Has 63.55g These sides are normal: http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_01.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_02.JPG But look at that! http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_03.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_04.JPG http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_05.JPG Hmm, shall we sell it too? O.k :-) Your Meteorite House Von: Meteoriteshow [mailto:meteorites...@free.fr] Gesendet: Montag, 27. Mai 2013 17:32 An: 'Martin Altmann'; meteorite-list@meteoritecentral.com Betreff: RE: [meteorite-list] (House-AD): Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented! Hi All again, It seems that my link didn't work; let me try again, actually I have several pictures: http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/bengu erir-7 9.6g(1).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/bengu erir-7 9.6g(7).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/bengu erir-7 9.6g(6).jpg http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/bengu erir-7 9.6g(3).jpg Cheers Fred www.meteoriteshow.com IMCA #2491 -Message
[meteorite-list] NASA's WISE Mission Finds Lost Asteroid Family Members
May 29, 2013 J.D. Harrington Headquarters, Washington 202-358-5241 j.d.harring...@nasa.gov Whitney Clavin Jet Propulsion Laboratory, Pasadena, Calif. 818-354-4673 whitney.cla...@jpl.nasa.gov RELEASE: 13-157 NASA'S WISE MISSION FINDS LOST ASTEROID FAMILY MEMBERS WASHINGTON -- Data from NASA's Wide-field Infrared Survey Explorer (WISE) have led to a new and improved family tree for asteroids in the main belt between Mars and Jupiter. Astronomers used millions of infrared snapshots from the asteroid-hunting portion of the WISE all-sky survey, called NEOWISE, to identify 28 new asteroid families. The snapshots also helped place thousands of previously hidden and uncategorized asteroids into families for the first time. The findings are a critical step in understanding the origins of asteroid families, and the collisions thought to have created these rocky clans. NEOWISE has given us the data for a much more detailed look at the evolution of asteroids throughout the solar system, said Lindley Johnson, the program executive for the Near-Earth Object Observation Program at NASA Headquarters in Washington. This will help us trace the NEOs back to their sources and understand how some of them have migrated to orbits hazardous to the Earth. The main asteroid belt is a major source of near-Earth objects (NEOs), which are those asteroids and comets that come within 28 million miles (45 million kilometers) of Earth's path around the sun. Some near-Earth objects start out in stable orbits in the main asteroid belt, until a collision or gravitational disturbance flings them inward like flippers in a game of pinball. The NEOWISE team looked at about 120,000 main belt asteroids out of the approximately 600,000 known. They found that about 38,000 of these objects, roughly one third of the observed population, could be assigned to 76 families, 28 of which are new. In addition, some asteroids thought to belong to a particular family were reclassified. An asteroid family is formed when a collision breaks apart a large parent body into fragments of various sizes. Some collisions leave giant craters. For example, the asteroid Vesta's southern hemisphere was excavated by two large impacts. Other smash-ups are catastrophic, shattering an object into numerous fragments, as was the case with the Eos asteroid family. The cast-off pieces move together in packs, traveling on the same path around the sun, but over time the pieces become more and more spread out. Previous knowledge of asteroid family lineages comes from observations of their orbits. NEOWISE also looked at the asteroids' reflectivity to identify family members. Asteroids in the same family generally have similar mineral composition and reflect similar amounts of light. Some families consist of darker-colored, or duller, asteroids, while others are made up of lighter-colored, or shinier, rocks. It is difficult to distinguish between dark and light asteroids in visible light. A large, dull asteroid can appear the same as a small, shiny one. The dark asteroid reflects less light but has more total surface area, so it appears brighter. NEOWISE could distinguish between the dark and light asteroids because it can detect infrared light, which reveals the heat of an object. The larger the object, the more heat it gives off. When the size of an asteroid can be measured, its true reflective properties can be determined, and a group of asteroids once thought to belong to a single family circling the sun in a similar orbit can be sorted into distinct families. We're separating zebras from the gazelles, said Joseph Masiero of NASA's Jet Propulsion Laboratory (JPL) in Pasadena, Calif., who is lead author of a report on the new study that appears in the Astrophysical Journal. Before, family members were harder to tell apart because they were traveling in nearby packs. But now we have a better idea of which asteroid belongs to which family. The next step for the team is to learn more about the original parent bodies that spawned the families. It's as if you have shards from a broken vase, and you want to put it back together to find out what happened, said Amy Mainzer, the NEOWISE principal investigator at JPL. Why did the asteroid belt form in the first place and fail to become a planet? We are piecing together our asteroids' history. JPL, a division of the California of Technology in Pasadena, managed and operated WISE for NASA's Science Mission Directorate. The spacecraft was put into hibernation mode in 2011, after completing its main objectives of scanning the entire sky twice. More information is online at: http://www.nasa.gov/wise -end- __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com
[meteorite-list] MRO HiRISE Images - May 29, 2013
MARS RECONNAISSANCE ORBITER HIRISE IMAGES May 29, 2013 o Endeavour Crater Western Rim http://hirise.lpl.arizona.edu/dtm/dtm.php?ID=ESP_018701_1775 This digital terrain model covers the western rim of Endeavour Crater where the Mars Exploration Rover Opportunity has been investigating since 2011. o Active Slope Flows on the Central Hills of Hale Crater http://hirise.lpl.arizona.edu/ESP_031203_1440 In some cases, there are many seasonal flows on warm slopes, suggesting some role for water in their activity. o Crater with Debris Aprons in Tyrrhena Terra http://hirise.lpl.arizona.edu/ESP_031805_1545 The interior rims of this crater are lined with debris aprons consisting of material eroded from the alcoves at the top of the crater walls. o Valleys in Tyrrhena Terra http://hirise.lpl.arizona.edu/ESP_031817_1410 These valleys are very different in appearance compared to the very old, large, and well-developed valley networks on Mars. All of the HiRISE images are archived here: http://hirise.lpl.arizona.edu/ Information about the Mars Reconnaissance Orbiter is online at http://www.nasa.gov/mro. The mission is managed by NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology, for the NASA Science Mission Directorate, Washington, D.C. Lockheed Martin Space Systems, of Denver, is the prime contractor and built the spacecraft. HiRISE is operated by the University of Arizona. Ball Aerospace and Technologies Corp., of Boulder, Colo., built the HiRISE instrument. __ 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] Nickel-iron meteorite used to make 5, 000 year old Egyptian beads
The article: http://www.nature.com/news/iron-in-egyptian-relics-came-from-space-1.13091 reports on an article behind a paywall: Analysis of a prehistoric Egyptian iron bead with implications for the use and perception of meteorite iron in ancient Egypt Diane Johnson, Joyce Tyldesley, Tristan Lowe, Philip J. Withers, Monica M. Grady. Meteoritics Planetary Science online: 20 May 2013 DOI: 10./maps.12120 http://onlinelibrary.wiley.com/doi/10./maps.12120/abstract Abstract: Tube-shaped beads excavated from grave pits at the prehistoric Gerzeh cemetery, approximately 3300 BCE, represent the earliest known use of iron in Egypt. Using a combination of scanning electron microscopy and micro X-ray microcomputer tomography, we show that microstructural and chemical analysis of a Gerzeh iron bead is consistent with a cold-worked iron meteorite. Thin fragments of parallel bands of taenite within a meteoritic Widmanstätten pattern are present, with structural distortion caused by cold-working. The metal fragments retain their original chemistry of approximately 30 wt% nickel. The bulk of the bead is highly oxidized, with only approximately 2.4% of the total bead volume remaining as metal. Our results show that the first known example of the use of iron in Egypt was produced from a meteorite, its celestial origin having implications for both the perception of meteorite iron by ancient Egyptians and the development of metallurgical knowledge in the Nile Valley. The Nature write-up includes a quote from a museum creator that during the time of the Pharaohs, the gods were believed to have bones made of iron. - Robin __ 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
