[meteorite-list] Identification of 2 historical meteorites from S America

From: cdtucson at cox.net <*cdtucson_at_meteoritecentral.com*> Date: Mon, 27 Jun 2011 14:27:39 -0400 Message-ID: <20110627142739.JV8K5.1013531.imail_at_fed1rmwml30> · cdtucson_at_meteoritecentral.com

--

"Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote". 

---- Zelimir.Gabelica at uha.fr wrote: 
> Hi Arnaud,
> 
> "Atacama" is the current synonym of Imilac (London NHM Catalog- Grady et al).
> 
> See:
> 
> http://www.lpi.usra.edu/meteor/metbull.php?code=12025
> 
> Look at the end of the writeup for all other synonyms of Imilac.  
> "Perou" is not mentioned...(see below)
> 
> Note that Copiapo is another meteorite having the same synonym "Atacama".
> 
> See, e.g.: G. Watson, 1938:
> http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1077155/pdf/pnas01800-0010.pdf
> 
> However, Copiapo is an IAB iron (silicated) and its recognized synonym  
> is rather "Atacama Desert" or "Desert of Atacama" (Grady, op. cit.).
> Also, Copiapo (20 kg chunk) was discovered in 1863 (thus after 1842  
> but before 1866....)
> 
> For other Imilac synonym possibilities and variants, see:
> 
> http://www.lpi.usra.edu/meteor/metbull.php
> 
> On your picture 1, the three iron samples as shown neither resemble a  
> pallasite in general nor imilac in particular. But you should better  
> know, by perhaps better examining these specimans and/or searching for  
> some olivine remanents.
> 
> Now against "Imilac" is the analysis repoprted by Wasson (THE world  
> iron meteorite specialist): Fe: 90%; Ni: 9.9%; Ga: 21.1 ppm; Ge: 46  
> ppm and Ir: 0.071 ppm (and NO chromium mentioned) which is definitely  
> different from the analysis you are mentioning (Turner)....
> 
> Regarding "Perou", this name was never reported for Imilac, though the  
> 3 pictures you show in link 2 are by all means Imilac (very typical!).
> 
> I tried to find out a meteorite having as synonym "Perou" (or P?rou,  
> or Peru...) but failed (would need more time and patience)
> 
> In conclusion, after this 15-20 min searching the literature I have  
> here on hand (Mulhouse), it seems that the "Perou" (link 2) is most  
> probably Imilac (but only from visual comparison) while the "Atacama"  
> (link 1), although official synonym of Imilac, neither corresponds  
> from pics comparison (though your pics are not fully clear as prints),  
> nor regarding its Ni analysis....
> 
> I hope this helps to promote to some extent the "schmilblick"....
> 
> Bonne chance....
> 
> Zelimir
> 
> (Note: after writing this, I noticed a few other replies. Seems link  
> N?2 is well confirmed as Imilac. However, part of the mystery remains  
> ragarding samples from link 1 ....)
> 
> 
> rm31 at free.fr a ??crit??:
> 
> >
> > Hi List,
> >
> > I've been following the list for about a year now and this is my  
> > first post. I
> > must say I've learned a lot from you even, sometimes, in the middle  
> > of an heated
> > discussion. Meteorites definitely bring a lot of passions.
> >
> > I'm a geologist, French and I live in Toulouse, a busy city of SW  
> > France -Airbus
> > main factory and office are here- but where people know how to  
> > relax. Toulouse
> > is also where the oldest western academy was founded, the "Academy  
> > of the Floral
> > Games" or "College of the Happy Science", in 1323!
> >
> > I'm pursuing some historical researches about meteorites. I've collaborated
> > off-list with Mark Grossman (hello Mark!) on several issues -check his
> > "meteorite manuscripts" blog if you haven't already. Aside from my  
> > main study,
> > that I'll present later, I'm doing an history-focused catalogue of the
> > meteorites that are kept in Toulouse in 2 collections, University and Museum.
> > The Natural History Museum is a small but nice one and was entirely  
> > renovated a
> > few years ago. The meteorite collection is also small but we have  
> > here about a
> > half kg of Orgueil (located about 35 km N of Toulouse), two fist-sized Ausson
> > samples and the unique and 99% complete 14 kg stone of Saint Sauveur  
> > (EH5) that
> > fell a few days before the onset of WW1, in 1914, 15 km N of Toulouse:
> > http://www.museum.toulouse.fr/explorer_3/les_collections_20/roches_mineraux_80/meteorites_424/chondrite_enstatite_426/index.html?lang=fr
> >
> > We have some trouble to identify 2 meteorites from the Museum, that's why I'm
> > calling for help. Many of you have seen lots of meteorites and you may
> > specifically recognize these stones before or have information that  
> > may lead to
> > their identification. I give below all the information I have (be  
> > careful, some
> > may be erroneous) and links to pictures.
> >
> > #1: so called "Atacama", sometimes with "Perou" attached
> >  3 irons, 8,5+1,7+0,5 g
> >  acquired by the Museum possibly before 1842, certainly before 1866
> >  "Fragment of the mass kept in Vienna. Analyzed by Turner: Fe 93,40,  
> > Ni 6,62, Cr
> > 0,54"
> >  http://i29.servimg.com/u/f29/10/09/49/44/atacam10.jpg
> >
> > #2: so called "Perou"
> >  1 iron, possibly a weathered pallassite, 15 g
> >  acquired in 1958 or later
> >  http://i29.servimg.com/u/f29/10/09/49/44/parou10.jpg
> >
> > Hope you can help!
> >
> > Renaud
> > ______________________________________________
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> >
> 
> 
> 
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