[meteorite-list] RES: Quartz on meteorites

From: Carl Agee <agee_at_meteoritecentral.com>
Date: Mon, 25 Sep 2017 17:58:22 -0600
Message-ID: <CADYrzhpiQ_Zr2CwUoRM+9NGJSw7TgiEAq2H18LsqrSDFcZXpXw_at_mail.gmail.com>

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
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 Mon, Sep 25, 2017 at 5:43 PM, Abdelfattah Gharrad via
Meteorite-list <meteorite-list at meteoritecentral.com> wrote:
> 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 Prof. Carl Agee
>
> Physical characteristics: TKW: 571 g. Dark brown exterior, saw cut reveals fine grained oxidized brown interior with fine weathering veins.
>
> Petrography: (C. Agee, UNM) SEM, EDS, EMPA. Microprobe examination of a polished mount shows olivine, low-Ca pyroxene, plagioclase, few small, <500 micron, extensively equilibrated chondrules, ubiquitous troilite, oxidized kamacite, and weathering veins .
>
> Mineral compositions and Geochemistry: (C. Agee and N. Wilson, UNM) EMPA. Olivine Fa19 Fe/Mn=42, low-Ca pyroxene Fs17 Wo1.4 Fe/Mn=24, plagioclase Ab81.
>
> Classification: Ordinary chondrite (H6), moderately weathered.
>
> Specimens: Oakes holds the main mass, 22.9 g including a probe mount on deposit at UNM.
>
> Best regards,
> Abdelfattah.
>
>
>
> --------------------------------------------
> En date de : Lun 25.9.17, Andr? Moutinho via Meteorite-list <meteorite-list at meteoritecentral.com> a ?crit :
>
> Objet: [meteorite-list] RES: Quartz on meteorites
> ?: "ALAN RUBIN" <aerubin at ucla.edu>, "Abdelfattah Gharrad" <agharrad74 at yahoo.com>, "meteorite list" <meteorite-list at meteoritecentral.com>
> Date: Lundi 25 septembre 2017, 17h48
>
> Hello all,
>
> Morro do Rocio is a Brazilian meteorite
> that s?lica 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: s?bado, 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
>
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>
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>
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>
>
>
> office phone: 310-825-3202
>
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>
> e-mail: aerubin at ucla.edu
>
> website: http://cosmochemists.igpp.ucla.edu/Rubin.html
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Received on Mon 25 Sep 2017 07:58:22 PM PDT