[meteorite-list] RES: Quartz on meteorites
Abdelfattah Gharrad
life19maroc at yahoo.fr
Mon Sep 25 19:43:52 EDT 2017
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, André Moutinho via Meteorite-list <meteorite-list at meteoritecentral.com> a écrit :
Objet: [meteorite-list] RES: Quartz on meteorites
À: "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 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.
______________________________________________
Visit our Facebook page https://www.facebook.com/meteoritecentral
and
the Archives at http://www.meteorite-list-archives.com
Meteorite-list mailing list
Meteorite-list at meteoritecentral.com
https://pairlist3.pair.net/mailman/listinfo/meteorite-list
--
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
______________________________________________
Visit our Facebook page https://www.facebook.com/meteoritecentral
and the Archives at http://www.meteorite-list-archives.com
Meteorite-list mailing list
Meteorite-list at meteoritecentral.com
https://pairlist3.pair.net/mailman/listinfo/meteorite-list
More information about the Meteorite-list
mailing list