[meteorite-list] Quartz on meteorites

From: ALAN RUBIN <aerubin_at_meteoritecentral.com>
Date: Sat, 23 Sep 2017 17:28:14 -0700
Message-ID: <CACWzm1z21fNgM5HCrg_YBVUgF1uSdR+aG1vcNNwBuqxL4j2Zgg_at_mail.gmail.com>

A few meteorites do contain rare grains of SiO2 including tridymite, quartz
and cristobalite, but generally these grains are quite small and intergrown
with other silicate phases. Some IVA irons contain a few blades of
trydimite, but if you see a rock with several percent or more of quartz
grains that are millimeter size or larger, it will not be a meteorite.

On Sat, Sep 23, 2017 at 4:46 PM, Abdelfattah Gharrad via Meteorite-list <
meteorite-list at meteoritecentral.com> wrote:

> Hello members,
>
> I really want to post my question about quartz longtimes ago, what I
> learned that if one sees quartz on a stone then the stone is not meteorite.
> in my knowledge there are different types of quartz and whose chemical
> formula is SiO2.
>
> habitually no quartz in the meteorites but if there is in a meteorite then
> it is a rare stone and whose classification differs from other meteorites
> and testimony of another planet it's just opinion.
>
> I think that the meteorites have chemical compositions like the
> terrestrial stones (magmatic, volcanic ...). the probability that a
> meteorite contains SiO2 is not zero.
>
> if there is a clarification please.
>
> Thanks,
> Abdelfattah.
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-- 
Alan Rubin
Institute of Geophysics and Planetary Physics
Department of Earth, Planetary, and Space Sciences
University of California
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Received on Sat 23 Sep 2017 08:28:14 PM PDT