[meteorite-list] Quartz on meteorites
From: cdtucson at cox.net <cdtucson_at_meteoritecentral.com>
Date: Mon, 25 Sep 2017 11:07:06 -0400
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.
-- 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. > > ______________________________________________ > > > > Visit our Facebook page https://www.facebook.com/meteoritecentral and the > > Archives at http://www.meteorite-list-archives.com > > Meteorite-list mailing list > > Meteorite-list at meteoritecentral.com > > https://pairlist3.pair.net/mailman/listinfo/meteorite-list > > > > > > -- > 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 > Los Angeles, CA 90095-1567 > USA > > office phone: 310-825-3202 > fax: 310-206-3051 > e-mail: aerubin at ucla.edu > website: http://cosmochemists.igpp.ucla.edu/Rubin.htmlReceived on Mon 25 Sep 2017 11:07:06 AM PDT