[meteorite-list] RePallasites

From: Jason Utas <meteoritekid_at_meteoritecentral.com>
Date: Tue, 8 Sep 2009 20:57:27 -0700
Message-ID: <93aaac890909082057v43ae617ey18eb74e82a4608de_at_mail.gmail.com>

Hello Pete,
I'm not as well-versed in the science of such things as many on the
list, but I would point out that there are many multi-kg specimens of
Brenham that are composed entirely of iron. Other good examples of
similar features occurring in meteorites including, but not limited
to, Seymchan, initially mis-classified as a IIE iron because no
olivine was observed in the first pieces discovered, as well as the
Glorieta Mountain pallasite - the main mass was, from what I've heard,
was 100% nickel-iron, with some troilite and schreibersite inclusions.

Well, have a look:

http://www.nyrockman.com/auction-2008/lots/seymchan3376g.htm

http://www.meteoritefinder.com/catalog/glorieta-col-947.htm

http://www.meteoritefinder.com/collection/glorieta-101.7.htm

http://www.meteoritefinder.com/collection/glorieta-175.6.htm

To that end, I believe it's safe to say that the spacing of the
olivine crystals has noting to do with distance from the core.
Regards,
Jason


On Tue, Sep 8, 2009 at 8:26 PM, Pete Shugar<pshugar at clearwire.net> wrote:
> Hello list,
> I have a question.
> I have a piece of Brenham, Ks. It has very slim metal dividers that seperate
> the Olivine crystal pockets.
> There are other Pallasites that have much thicker metal dividers with
> smaller
> Olivine pockets.
> The question----would the former be formed further from the core than the
> latter?
> In other words, are there differences in the Olivine/Ni-Fe ratio if the
> meteorite
> comes from the area closer to the core or further away from the core per a
> cubic
> meter quantity of each.
> Pete IMCA 1733
>
>
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Received on Tue 08 Sep 2009 11:57:27 PM PDT