[meteorite-list] Sikhote-Alin Question

From: M come Meteorite Meteorites <mcomemeteorite2004_at_meteoritecentral.com>
Date: Tue Jul 11 20:40:44 2006
Message-ID: <20060711182644.74770.qmail_at_web26208.mail.ukl.yahoo.com>

and of this what you say?

http://www.mcomemeteorite.it/images/SikhoteAlingr.2162.JPG

Matteo

--- Martin Horejsi <accretiondesk_at_gmail.com> ha
scritto:

> Hi All,
>
> I knew I had seen that feature somewhere, but I
> could not remember at the time.
>
> Anyway I found it. It was in a 0.334g oriented
> Bensour individual I
> have in my collection.
>
> Here are three pics of the piece. While on an
> entirely different
> scale, both in size and class, it does have a
> striking resemblance to
> the feature in the Sikhote-Alin that caused this
> thread.
>
> http://www.geocities.com/planetwhy/bensour1.jpg
>
> http://www.geocities.com/planetwhy/bensour2.jpg
>
> http://www.geocities.com/planetwhy/bensour3.jpg
>
> Happy contemplating.
>
> Martin
>
>
>
>
> On 27 Jun 2006 20:38:24 UT, bernd.pauli_at_paulinet.de
> <bernd.pauli_at_paulinet.de> wrote:
> > Eric wrote:
> >
> > "Anyone want to take a stab at what it might be.
> > I have no good explanations. Here is a link to
> > the auction"
> >
> >
>
<http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=3239&item=230002162891>
> >
> > OK, ... taking a stab at what it might be. If it
> is NOT one of those
> > impact-produced surface craters that McHone and M.
> Killgore describe
> > in "Impact-produced surface craters on
> Sikhote-Alin irons" (cp. MAPS
> > 33-4, Supplement, 1998, p. A101), it might be
> troilite surrounded by
> > schreibersite + swathing kamacite.
> >
> > Buchwald wrote about Sikhote-Alin:
> >
> > "Troilite occurs in minor amounts, mostly
> associated with the
> > schreibersite skeleton crystals which in many
> instances may have
> > nucleated upon the troilite. The troilite forms
> 1-10 mm nodules
> > and lenticular bodies. In most cases it forms the
> central part
> > of cm-sized, intricate, lace-like textures where
> schreibersite
> > filaments and hieroglyphs radiate from the
> troilite in structures
> > that suggest coarse-grained eutectics (+). Similar
> structures are
> > present in, e.g., Sao Juliao, Sandia Mountains and
> S a n t a
> > L u z i a*."
> >
> > .., and on p. 1074, Buchwald wrote about Santa
> Luzia*:
> >
> > BUCHWALD V.F. (1975) Iron Meteorites (Univ. of
> > California, 1975, Vol.3, excerpts from p. 1074):
> >
> > "Not only is the troilite elongated parallel to
> the present exterior surface,
> > but the schreibersite-metal eutectics (+)
> associated with it also appear to
> > have formed parallel cylinders 10-40 mm in
> diameter. Later, swathing kamacite
> > has grown around these cylinders in the solid
> state to form concentric shells,
> > 5-15 mm thick. Troilite forms the central part of
> the cylinders, but, since
> > it pinches and swells irregularly, it may or may
> not be present in a given
> > section perpendicular to the cylinders."
> >
> > (+) McSWEEN H.Y. (1999) Meteorites and Their
> Parent Planets
> > Cambridge University Press, Glossary, p. 290): the
> liquid that
> > occurs at the lowest temperature in a chemical
> system.
> >
> > So, maybe, we are looking at a cross-section of
> such a cylinder.
> >
> > Well, probably not quite as interesting as the
> ongoing discussion
> > about fraudulent trade practices, but, anyway, ...
> my stab ;-)
> >
> >
> > Bernd
> >
> > ______________________________________________
> > Meteorite-list mailing list
> > Meteorite-list_at_meteoritecentral.com
> >
>
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> >
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>


M come Meteorite - Matteo Chinellato
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Received on Tue 11 Jul 2006 02:26:44 PM PDT