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

From: Graham Ensor <graham.ensor_at_meteoritecentral.com>
Date: Wed, 29 May 2013 08:51:09 +0100
Message-ID: <CAJkn+kYdKjzKL2-10crQtWFr2678QoGRyvX6tfT0cT37z+t0rA_at_mail.gmail.com>

Hi All....Svend has an explanation for this brown crust on his
excellent website....from several years back.

http://www.niger-meteorite-recon.de/en/Meteorite_fusion_crust_2.htm

Cheers,

Graham

On Tue, May 28, 2013 at 9:58 PM, Steve Witt <stelor96 at yahoo.com> wrote:
> Martin, Fred and all,
>
> I just got in some of the new meteorite from Mauritania showing the same thing. No black lipping, but brown crust on the back side of a fresh stone.
>
> Front: http://www.flickr.com/photos/stevewitt/8870872109/
>
> Back: http://www.flickr.com/photos/stevewitt/8870872297/
>
>
>
> Steve Witt
> IMCA #9020
> http://imca.cc/
>
>
> ________________________________
> From: Martin Altmann <altmann at meteorite-martin.de>
> To: meteorite-list at meteoritecentral.com
> Sent: Monday, May 27, 2013 4:03 PM
> Subject: Re: [meteorite-list] (House-AD): ORANGE fresh Chelyabinsk (was: Two special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented!)
>
>
> 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 Wed 29 May 2013 03:51:09 AM PDT