[meteorite-list] Cristobalite

[ALAN RUBIN]

Free silica is at most an accessory component in known meteorites. If
the whole rock has a high cristobalite peak, it is likely a
terrestrial rock. Possibilities include sandstone, quartzite and
various silicaceous igneous rocks.

On Fri, May 21, 2021 at 4:05 PM yasmani.ceballo--- via Meteorite-list
<meteorite-list at meteoritecentral.com> wrote:
>
> Hello friends
> I have a surviving difractogram of a rock that was thinked to be
> meteorite in the past, but now is lost.
> The only information we have is the presence of these minerals:
> cristobalite, quartz, olivine, enstatite, plagioclase and amorphous
> materials. Probably super high peaks of cristobalite, followed by
> quartz.
> This is the only information we have, so I know is nothing, but with
> that how we can say?
> I mean, a high cristobalite peak mean anything? There is no
> cristobalite in the geology of the area where the rock is believed to
> have fallen.
> Thanks
>
>
>
>
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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
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e-mail: aerubin at ucla.edu
website: http://cosmochemists.igpp.ucla.edu/Rubin.html