If any of you want an old reference, there is an abstract by Grant from 1968:
GRANT, R. W., 1968. The occurrence of silica minerals in meteorites. Program 31st Meeting Meteoritical Sot., Cambridge, Mass., 1968 (abstract). Alan Rubin On Mon, Sep 25, 2017 at 9:48 AM, André Moutinho <[email protected]> wrote: > Hello all, > > Morro do Rocio is a Brazilian meteorite that sílica was found: > http://adsabs.harvard.edu/full/1985Metic..20..467F > > Best > > Andre > > > > De: Meteorite-list > [mailto:[email protected]] Em nome de ALAN > RUBIN via Meteorite-list > Enviada em: sábado, 23 de setembro de 2017 21:28 > Para: Abdelfattah Gharrad <[email protected]> > Cc: Meteoritecentral List <[email protected]> > Assunto: Re: [meteorite-list] Quartz on meteorites > > > > 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 <[email protected]> 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 > [email protected] > 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: [email protected] > > website: http://cosmochemists.igpp.ucla.edu/Rubin.html > -- 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: [email protected] website: http://cosmochemists.igpp.ucla.edu/Rubin.html
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