[meteorite-list] Quartz in meteorites

[Gary K. Foote]

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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