[meteorite-list] Quartz on meteorites

From: Carl Agee <agee_at_meteoritecentral.com>
Date: Mon, 25 Sep 2017 08:59:37 -0600
Message-ID: <CADYrzhqA5OTGvHXuNGo7Gyr5A3Drsp_JsQFTptGdo=OFPw-+hA_at_mail.gmail.com>

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 11119 has more than 20% silica polymorphs (mix of tridymite and
cristobalite).

Best regards,

Carl

*************************************
Carl B. Agee
President, Consortium for Materials Properties Research in Earth
Sciences (COMPRES)
Director, Institute of Meteoritics
Professor, Earth and Planetary Sciences
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126

Tel: (505) 750-7172
Fax: (505) 277-3577
Email: agee at unm.edu
http://meteorite.unm.edu/people/carl_agee/
http://compres.us/about-us/compres-president



On Sat, Sep 23, 2017 at 6:28 PM, 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
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> Los Angeles, CA 90095-1567
> USA
>
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> website: http://cosmochemists.igpp.ucla.edu/Rubin.html
>
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Received on Mon 25 Sep 2017 10:59:37 AM PDT