[meteorite-list] (House-AD): ORANGE fresh Chelyabinsk (was: Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented!)

From: Martin Altmann <altmann_at_meteoritecentral.com>
Date: Mon, 27 May 2013 23:03:20 +0200
Message-ID: <007601ce5b1d$9e475fe0$dad61fa0$_at_de>

Hi Fred,

Exactly and Wow!
With your Bensour it seems that just the same had happened!
Has also the black rim!


>My guess at the time I got it, was simply a matter of primary fusion crust
(the brownish one) and secondary fusion crust >(the darker one). Could it be
a matter of altitude where it was formed? Speed & temperature of fusion?...

There we definitely have to ask our experts of aerodynamics and chemistry
here.

To me it's evident, because the black crust lips over the brown one, that
that brown on the back must have been formed before the crust on the apex.

There are going things in flight on the back of the stones.... remember the
Tamdakht-Couscous or the 12.5kg-flat heat-shield, which had also such
fragments incorporated in the skin..

Now these color-crusts with Chelyabinsk (and Tissint).

Here, look, our most shocking example!
Is something for Jan, Menno or Rob,
Because half of the stone is almost: ORANGE!

Has 63.55g

These sides are normal:
http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_01.JPG

http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_02.JPG

But look at that!

http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_03.JPG

http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_04.JPG

http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_05.JPG

Hmm, shall we sell it too?
O.k....

:-)
Your Meteorite House



Von: Meteoriteshow [mailto:meteoriteshow at free.fr]
Gesendet: Montag, 27. Mai 2013 17:32
An: 'Martin Altmann'; meteorite-list at meteoritecentral.com
Betreff: RE: [meteorite-list] (House-AD): Two special Chelyabinsk
individualswith Brown Lee-side Crust - color-oriented!

Hi All again,

It seems that my link didn't work; let me try again, actually I have several
pictures:

http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/benguerir-7
9.6g(1).jpg

http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/benguerir-7
9.6g(7).jpg

http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/benguerir-7
9.6g(6).jpg

http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/benguerir-7
9.6g(3).jpg


Cheers

Fred
www.meteoriteshow.com
IMCA #2491

-----Message d'origine-----
De?: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] De la part de Martin
Altmann
Envoy??: lundi 27 mai 2013 14:26
??: meteorite-list at meteoritecentral.com
Objet?: [meteorite-list] (House-AD): Two special Chelyabinsk individualswith
Brown Lee-side Crust - color-oriented!
Importance?: Haute

Hello there,

we have to share with you a pretty exciting observation.
It was here already on the list, that some of you found on the first-pick
Chelyabinskis places with a brownish, nevertheless fresh fusion crust. That
phenomenon btw. you had sometimes also on a few Tissints, there the brown
crust was even translucent (were horribly difficult to sell, because people
watching the photos were skeptical, thought, they wouldn't be fresh, but
weathered - and that, where no iron is present in Tissint to rust).

Many of you blossomed during the last 3 months into true
Chelyabinsk-experts,
so please, pay attention to those two individuals and tell us your opinion:

75.45g

http://www.meteoritenhaus.de/img/Chelyabinsk_75_45_g_01.JPG
http://www.meteoritenhaus.de/img/Chelyabinsk_75_45_g_02.JPG
http://www.meteoritenhaus.de/img/Chelyabinsk_75_45_g_03.JPG


68.37g

http://www.meteoritenhaus.de/img/Chelyabinsk_68_37_g_01.JPG
http://www.meteoritenhaus.de/img/Chelyabinsk_68_37_g_02.JPG
http://www.meteoritenhaus.de/img/Chelyabinsk_68_37_g_03.JPG
http://www.meteoritenhaus.de/img/Chelyabinsk_68_37_g_04.JPG


Well, baffling, aren't they?

Both of them have a side, and ONLY one side, which is fully coated by the
brown crust,
while all other sides are black, as usual.

Here:
http://www.meteoritenhaus.de/img/Chelyabinsk_68_37_g_02.JPG

And here:
http://www.meteoritenhaus.de/img/Chelyabinsk_75_45_g_02.JPG


And you see, that the brown-side is framed all around by a lipping, which is
black,
hence most would therefore say, only because of the rollover-lip, that the
stones are flight-oriented.
At least one can say, by means of the circular lipping around the edges,
that the stones had for a longer time a stable position in flight.
And that the brown side is the backside, the lee-side.

And what is striking, is, that the lipping overlaps the brown crust, hence
the brown crust must have formed simultaneously, while the front surface was
melting.

Now one could speculate, what could have caused that different crust - from
the chip missing in one of the stones, we see that the material beneath the
brown crust isn't special (anyway, on the sides the fusion crust for the
same material is black).
Thus maybe the different color could stem from a lack of oxygen, when it
melted, on the lee-side of the stone in flight, where one has a low
pressure/partial vacuum?

We think, one could even speak of a new category of orientation:

COLOR-ORIENTED!


Well, if you like to have them, what shall we do with so special
specimens...
Let's make 20$/g to be among the very cheapest Chelyabinsk-offerers,
+ 50cents for the lipping, where others would scream: oriented, oriented!
+ 1.5$/g for the fantastic "color-orientation"...

Makes??? 22$/g.


Fascinating, aren't they?

Your Meteorite House Team


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Received on Mon 27 May 2013 05:03:20 PM PDT