[meteorite-list] Chassigny Chondrules

From: j.divelbiss_at_att.net <j.divelbiss_at_meteoritecentral.com>
Date: Thu Apr 22 10:21:10 2004
Message-ID: <20030729024429.4BB465355A_at_pairlist.net>

Hello all,

Well I just checked out my Chassigny slic..er...fragm...er...sand grain-like
speck, and it has about 5 or 6 nice round olivine crystals, and 3 or 4 small
bits of black inclusion mixed in them. A really nice specimen. 20x and 40x
power work best. No chondrules though...the glassy look of the olivine makes
it look more like quartz...ouch!!!

Actually of friend of mine and yours recently bought a large 1/2 gram
fragment... that by today's standards is a real find. This just tells you how
rare it is to get a hold of. Has anyone ever seen a picture of a nice big
slice??? The pictures of it seem just as rare.

For those without a sample of Chassigny...the guys at meteorites.com still
have a little bit to sell ...I think.

Take care,

John
> Hi, all.
>
> Chassigny contains no chondrules. It does have spherical and ellipsoidal
> inclusions in its olivine crystals. The inclusions contain silica-rich
> glass,
> pryoxene sprays, amphibole, whitlockite, and biotite. Their textures look a
> bit like chondrules, but that only represents the same physical conditions:
> rapid cooling of silicate magma.
> Several papers in the technical literature have nice photos of these
> magmatic
> inclusions: 1) Floran et al., 1978, Geochim. Cosmochim. Acta 42, 1213-1229.
> 2) Johnson et al., 1991, Geochim. Cosmochim. Acta 55, 349-366.
>
>
> The idea of chondrules in Chassigny dates back at least to 1962, in the
> paper Jeremine E., Orcel J., and Sandrea A. (1962) Etude mineralogique
> et structurale de la meteorite de Chassigny. Bull. Soc. fr. Mineral. Crist.
> LXXXV, 262-266. They showed pictures of the magmatic inclusions, and
> (apparently thinking only of chondrite meteorites, and not 'normal'
> igneous rocks) called them "chondre naissant."
>
> Cheers
>
> Allan
>
> Allan H. Treiman
> Senior Staff Scientist
> Lunar and Planetary Institute
> 3600 Bay Area Boulevard
> Houston, TX 77058-1113
> 281-486-2117
> 281-486-2162 (FAX)
> -----Original Message-----
> From: mark ford [mailto:markf_at_ssl.gb.com]
> Sent: Monday, July 28, 2003 9:43 AM
> To: meteorite-list_at_meteoritecentral.com
> Subject: [meteorite-list] Chassigny Chondrules
>
>
>
>
>
> Hi,
>
> Does anyone know what the current thinking on the 'Chassigny Chondrules' is?
> - (as to what they actually are or how they formed?)
>
> I found this, but can anyone point me in the direction of any further
> information?
>
> http://www.geocities.com/~dweir/chassig1.htm
> <http://www.geocities.com/~dweir/chassig1.htm>
>
>
> Cheers
> Mark F.
>
Received on Mon 28 Jul 2003 10:44:26 PM PDT