Re: [meteorite-list] RES: Quartz on meteorites

Abdelfattah: The quartz grains stuck in the sample I assume are terrestrial, of course the H6 is meteorite! Best regards, Carl * Carl B. Agee President, Consortium for Materials Properties Research in Earth Sciences (COMPRES) Director, Institute of Meteoritics

Re: [meteorite-list] RES: Quartz on meteorites

Hello all and thanks for answers and it's nice to have more idea and learning from all. if we see grains of quartz stuck on a stone so this stone is not meteorite? a stone that I had the opportunity to see mottled with quartz grains (SiO2) and it is a meteorite analyzed as H6 chondrite by

Re: [meteorite-list] Quartz on meteorites

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

[meteorite-list] RES: Quartz on meteorites

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:meteorite-list-boun...@meteoritecentral.com] Em nome de ALAN RUBIN via Meteorite-list Enviada em: sábado, 23 de setembro de 2017

Re: [meteorite-list] Quartz on meteorites

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

Re: [meteorite-list] Quartz on meteorites

Hi Alan, Perhaps you missed our talks at MetSoc: https://www.hou.usra.edu/meetings/metsoc2017/pdf/6129.pdf https://www.hou.usra.edu/meetings/metsoc2017/pdf/6268.pdf NWA 9 has more than 20% silica polymorphs (mix of tridymite and cristobalite). Best regards, Carl

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

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Re: [meteorite-list] In rare instance, lunar shadow cast on piece of moon during the eclipse

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[meteorite-list] Meteorite Picture of the Day

Today's Meteorite Picture of the Day: NWA XXX Contributed by: Simon Bartlett http://www.tucsonmeteorites.com/mpodmain.asp?DD=09/25/2017 __ Visit our Facebook page https://www.facebook.com/meteoritecentral and the Archives at