[meteorite-list] Quartz on meteorites

From: cdtucson at cox.net <cdtucson_at_meteoritecentral.com>
Date: Mon, 25 Sep 2017 11:07:06 -0400
Message-ID: <20170925110706.173VP.24242.imail_at_fed1rmwml302>

Hello, I think the question came up because of a facebook post in Meteorites by Stefan Ralew that says; "Probably the oldest quartz crystals of the solar system (quartz or tridimite). Found in a ungrouped achondrite meteorite from the Sahara. More information will follow...". Along with a really nice close-up picture of the crystal itself.

https://www.facebook.com/photo.php?fbid=880902565402927&set=gm.1827294997297820&type=3&theater&ifg=1

Carl

--
Love & Life
---- ALAN RUBIN via Meteorite-list <meteorite-list at meteoritecentral.com> wrote: 
> 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
> 3845 Slichter Hall
> 603 Charles Young Dr. E
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> USA
> 
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Received on Mon 25 Sep 2017 11:07:06 AM PDT