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 Pérou,
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 ....)
r...@free.fr a écrit :
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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