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

From: Galactic Stone & Ironworks <meteoritemike_at_meteoritecentral.com>
Date: Mon, 27 May 2013 17:24:12 -0400
Message-ID: <CAKBPJW-qsX6k0RkCj3cRFxTbHeHv+nwxo3FRW0AqLSOYK5hZkw_at_mail.gmail.com>

A theory from the peanut gallery -

Perhaps what we are seeing here is a product of the process of
orientation. Maybe during the phase where the crust is liquified and
flowing, certain more volatile elements will be burned off, and the
remaining crustal material gathers on the trailing side of the
meteorite and cools - but since it's chemistry has changed, it has a
different visual appearance of color. This brown/black curiosity
seems to be evident on falls that have stones known to be oriented or
with well-rounded features - the blockier types of stones do not show
this kind of process.

???

-- 
-------------------------------------------------------------
Web - http://www.galactic-stone.com
Facebook - http://www.facebook.com/galacticstone
Twitter - http://twitter.com/GalacticStone
Pinterest - http://pinterest.com/galacticstone
RSS - http://www.galactic-stone.com/rss/126516
-------------------------------------------------------------
On 5/27/13, Martin Altmann <altmann at meteorite-martin.de> wrote:
> 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
>
>
> ______________________________________________
>
> Visit the Archives at http://www.meteorite-list-archives.com
> Meteorite-list mailing list
> Meteorite-list at meteoritecentral.com
> http://six.pairlist.net/mailman/listinfo/meteorite-list
>
> ______________________________________________
>
> Visit the Archives at http://www.meteorite-list-archives.com
> Meteorite-list mailing list
> Meteorite-list at meteoritecentral.com
> http://six.pairlist.net/mailman/listinfo/meteorite-list
>

Received on Mon 27 May 2013 05:24:12 PM PDT