[meteorite-list] Breja Stone, chondrite

From: Meteorite-Recon.com <info_at_meteoritecentral.com>
Date: Mon, 9 Jan 2012 10:00:19 +0100 (CET)
Message-ID: <1968031611.350078.1326099619611.JavaMail.open-xchange_at_email.1und1.de

Thanks to everybody for your interest and your kind comments on the photo of the
Taousz/Breja stone which Michael kindly posted. Much appreciated.?
?
Carl,?the?degree of brown vs black in the?color of the fusion crust of a freshly
fallen chondrite is a function mainly of the magnetite (FeO?Fe2O3)?content in
the crust. The oxide composition in turn is basically controlled by the supply
of oxygen during the formation of the?crust. Thus, trailing faces, which formed
in near vacuum, often show a rich brown instead of the common?dull black.?A
textbook example is the little oriented Buzzard Coulee pictured?here:
http://www.meteorite-recon.com/en/Meteorite_fusion_crust_2.htm
?
Cheers
?
Svend??

?

http://www.rocksfromspace.org/taousz.html
?



cdtucson at cox.net hat am 6. Januar 2012 um 16:39 geschrieben:

> Michael, List,
> Fabulous photo.
> Any explanation as to why the fusion crust is soooooo brown on a fresh fall?
> Anyone!
> Thanks,
> Carl
> meteoritemax
> --
> Cheers
>
> ---- ROCKS FROM SPACE <rockmansc at yahoo.com> wrote:
> > http://www.rocksfromspace.org/taousz.html
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Received on Mon 09 Jan 2012 04:00:19 AM PST