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 ______________________________________________ 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
