[meteorite-list] Some help with [Brenham] inclusions

From: Mike Miller <meteoritefinder_at_meteoritecentral.com>
Date: Thu, 23 Aug 2007 08:26:18 -0700
Message-ID: <468bf6050708230826x3031ee1cg4f431dced27d9efe_at_mail.gmail.com>

Thanks Bernd and all who replied this help a lot.

On 21 Aug 2007 21:27:20 UT, bernd.pauli at paulinet.de
<bernd.pauli at paulinet.de> wrote:
> Mike wrote:
>
> "a description of which inclusions and colors go with which elements."
>
> Hello Mike and List,
>
> Here is my take: The round or slightly oval inclusions are troilite (FeS),
> an iron sulfide - in meteorites the Fe:S ratio is almost ideally 1:1, one
> iron atom versus one sulphur atom.
>
> The elongated, "skeletal", inclusion with that golden tint should be schreibersite
> crystals - chemical formula (Fe, Ni)3P.
>
> The silvery "lining" surrounding the troilite inclusions and also around these
> elongated schreibersite crystal aggregates is swathing kamacite. That's what
> meteoriticists call that thin rim that often surrounds troilite, schreibersite and
> silicate inclusions. This kamacite (nickel-iron with less than 7.5% nickel) is
> the first to form from taenite (nickel-iron with more than 25% nickel) during
> the primary cooling phase.
>
> Reference:
>
> BUCHWALD V.F. (1975) Handbook of Iron Meteorites, Volume 1, pp. 88-89.
>
> Best regards,
>
> Bernd
>
> P.S.: I've really enjoyed your and Ruben's Glorieta Expedition adventures
> in METEORITE; May 2007, Vol. 13, No. 2, pp. 15-18. Absolutely worth
> reading !
>
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-- 
Mike Miller Po Box 314 Gerber Ca 96035
www.meteoritefinder.com
     530-384-1598

Received on Thu 23 Aug 2007 11:26:18 AM PDT