[meteorite-list] Quartz on meteorites

[ALAN RUBIN]

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 <moutinho at gmail.com> 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:meteorite-list-bounces at meteoritecentral.com] Em nome de ALAN
> RUBIN via Meteorite-list
> Enviada em: sábado, 23 de setembro de 2017 21:28
> Para: Abdelfattah Gharrad <agharrad74 at yahoo.com>
> Cc: Meteoritecentral List <meteorite-list at meteoritecentral.com>
> 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 <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
>
> 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.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: aerubin at ucla.edu
website: http://cosmochemists.igpp.ucla.edu/Rubin.html
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