[meteorite-list] NEWS: Almahata Sitta meteorite

From: Peter Scherff <peterscherff_at_meteoritecentral.com>
Date: Sun, 30 May 2010 16:29:29 -0400
Message-ID: <005901cb0036$ce06feb0$6a14fc10$_at_com>

Hi Mike,

        My understanding is that they are all from the same fall. See below:

ASTEROID 2008 TC3 ? ALMAHATA SITTA: NOT ONLY A UREILITIC METEORITE, BUT A
BRECCIA CONTAINING MANY DIFFERENT ACHONDRITIC AND CHONDRITIC LITHOLOGIES. A.
Bischoff1, M. Horstmann1, M. Laubenstein2, and S. Haberer3. 1Institut f?r
Planetologie, Wilhelm-Klemm-Str. 10, D-48149 M?nster, Germany (e-mail:
bischoa at uni-muenster.de), 2Laboratori Nazionali del Gran Sasso, I.N.F.N.,
I-67010 Assergi (AQ), Italy, 3Haberer-Meteorites, Ruhbankweg 15, D-79111
Freiburg, Germany (e-mail: siegfried at haberermeteorite.de).

We are convinced that most, if not all different lithologies belong to the
Almahata Sitta meteorite fall. The main reasons are: (a) detection of the
short and medium short lived cosmogenic nuclides 46Sc, 57Co, and 54Mn. (b)
Preliminary studies show that at least two fragments contain two different
lithologies. (c) Among the fragments at least 6 different E chondrite
lithologies were detected. Enstatite chondrites are relatively rare and such
a high number of fresh Echondrite meteorite falls in just one small area is
unrealistic. (d) The discovery of several new unique meteorite fragments
(having so far unknown textures and mineralogy) in a small area is only
conceivable with a break-up of a polymict asteroid.

Thanks,

Peter

-----Original Message-----
From: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of Galactic
Stone & Ironworks
Sent: Friday, May 28, 2010 9:50 AM
To: siegfried at haberer-meteorite.de
Cc: meteorite-list at meteoritecentral.com
Subject: Re: [meteorite-list] NEWS: Almahata Sitta meteorite

Hi List,

I have always wondered about the multiple lithologies of this fall.
Is it possible that the multiple lithologies represent more than one
meteorite find? Did the Almahata Sitta ureilite fall into an existing
strewnfield and all of the meteorites got mixed during the recovery?
Has anyone tested the various lithologies to see if they are in fact
related?

Best regards,

MikeG


On 5/28/10, siegfried at haberer-meteorite.de
<siegfried at haberer-meteorite.de> wrote:
>
> Dear collector friends,
>
> Unique! The Almahata Sitta fall surprised us not only with the
circumstances
> of
> the fall but also with a multiplicity of different meteorite classes and
> various
> lithologies.
>
> Among the material is the MS-CH which is a chondrite that has been
> classified as
> ?unique?. Besides, the age determination for the MS-CH proved that the
> chondritic findings are also part of the mainly ureilitic Almahata Sitta
> fall.
> Although most of this rare meteorite MS-CH with a total weight of only
5.68g
> understandably has been placed at the disposal of science we can offer
some
> smaller fragments of it.
>
> If you are interested in the above mentioned meteorite or other recently
cut
> slices of different individuals of Almahata Sitta please have a look at
our
> website:
>
> www.haberer-meteorite.de
>
> We can offer slices and fragments of the following Almahata Sitta
> meteorites:
>
> Almahata Sitta Coarse-grained Ureilite: MS-169, MS-170
>
> Almahata Sitta Fine-grained Ureilite: MS-165, MS-152, MS-168
>
> Almahata Sitta Chondritic lithologies: MS-150 EL6, MS-11 H 5/6, MS-159
E5/6,
> MS-11, MS-174, MS-CH
>
> Best regards
>
> Karin and Siegfried
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-- 
------------------------------------------------------------
Mike Gilmer - Galactic Stone & Ironworks Meteorites
http://www.galactic-stone.com
http://www.facebook.com/galacticstone
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Received on Sun 30 May 2010 04:29:29 PM PDT