[meteorite-list] RES: Quartz on meteorites

[André Moutinho]

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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