[meteorite-list] Quartz in meteorites

From: Gary K. Foote <gary_at_meteoritecentral.com>
Date: Wed, 06 Feb 2008 07:32:54 -0500
Message-ID: <47A962A6.23750.DDB449_at_gary.webbers.com>

Here is a pic of NWA 4716 with what looks to be a round quartz inclusion in its upper right
corner. I haven't had any opinions on whether or not it is really quartz - may be feldspar.
Looks like it may be...

http://www.webbers.com/meteorites/images/bb11a.jpg

Gary

> "But in a very few quartz is found"
>
> Here are a few examples:
>
>
> MONTEIRO J.F. (1989) Preliminary study of the Chaves
> howardite (Meteoritics 24-4, 1989, pp. A305-A306):
>
> Quartz and tridymite were observed in thin section and, during
> electron microprobe
> work, many small complex intergrowths between plagioclase and
> pyroxene crystals
> were found to contain very high silica.
>
> RUBIN A.E. (1997) Mineralogy of meteorite groups
> (Meteoritics 32-2, 1997, 231-247, p. 241, excerpts):
>
> The basaltic shergottites are fine-grained rocks consisting of
> ...and accessory fayalite,
> quartz, baddeleyite and chlorapatite within the mesostasis (McSween,
> 1994).
>
> AFANASIEV S.V. et al. (2000) Dhofar 007 and Northwest Africa 011:
> Two new eucrites of different types (MAPS 35-5, 2000, Suppl.,
> A019):
>
> Northwest Africa 011 is an unbrecciated achondrite unlike Dhofar
> 007, with a metagabbroitic
> structure consisting of subhedral grains of pigeonite (0.5-0.6 mm)
> and plagioclase (0.05-0.1 mm).
> Accessories are metal, troilite, spinel, ilmenite, and quartz.
>
> (Lunar and Planetary Science XXXIII (2002) 1434.pdf):
>
> A New Shergottite From Oman, Dhofar 378
>
> The oxygen fugacity is consistent with the assemblage of fayalite,
> quartz, and magnetite.
>
> SEMENENKO V.P. et al. (1998) The Galkiv meteorite: A new H4
> chondrite from Ukraine (MAPS 33, 1998, A193-A196):
>
> The meteorite contains ...metallic Cu and rare grains of spinel and
> quartz.
>
>
> To: altmann at meteorite-martin.de
> meteorite-list at meteoritecentral.com
>
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Received on Wed 06 Feb 2008 07:32:54 AM PST