[meteorite-list] RES: Quartz on meteorites

From: Abdelfattah Gharrad <life19maroc_at_meteoritecentral.com>
Date: Mon, 25 Sep 2017 23:43:52 +0000 (UTC)
Message-ID: <347488655.15687338.1506383032434_at_mail.yahoo.com>

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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Received on Mon 25 Sep 2017 07:43:52 PM PDT