[meteorite-list] Gebel Kamil iron is official now - 1.6 metric tons!?!?

[Jason Utas]

Hello Mirko, All,
That's just not true at all - plenty of irons have seen plastic
deformation without becoming ataxites.


Seymchan:

http://www.carionmineraux.com/mineraux/Mineraux_Juillet_aout_2008/meteorite_seymchan_1.jpg

http://www.imca.cc/insights/2007/II06-img/Seymchan.jpg


Henbury:

http://www.minresco.com/meteor/meimages/me606d.jpg


Uruacu:

http://cgi.ebay.com/LOW-PRICE-URUACU-IRON-METEORITE-BRAZIL-END-CUT-804-GMS-/200446229790?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item2eab86bd1e#ht_1622wt_906

http://cgi.ebay.com/LOW-PRICE-URUACU-IRON-METEORITE-BRAZIL-END-CUT-514-GMS-/200421205241?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item2eaa08e4f9#ht_1579wt_906


- I've also seen examples of similar features in Sikhote-Alin,
Boxhole, Gibeon, and Campo del Cielo.

Plastic deformation due to impact does not result in the complete loss
of widmanstatten pattern.  The only plastically deformed ataxites that
lack any true pattern (that I can think of) are Chinga (deformed
schlieren) and this new Egyptian iron, neither of which appear to have
had widmanstatten patterns before entering the atmosphere.

Regards,
Jason

On Tue, Jul 13, 2010 at 5:30 AM, Martin Altmann
<altmann at meteorite-martin.de> wrote:
> But is there a finest octahedrite among the chemical IAB/IIICD-complex....?
> And are there coarsest octahedrites to be found among the IVAs?
>
> I think, it's quite reasonable, not to give a structural type at that point
> of time for the Egypt iron, if there were only shrapnels found, respectively
> analyzed.
> Shrapnels by their nature are always ataxitic.
>
> Or was meanwhile a not so damaged individual found and examined?
>
> Best!
> Martin
>
>
> -----Ursprüngliche Nachricht-----
> Von: meteorite-list-bounces at meteoritecentral.com
> [mailto:meteorite-list-bounces at meteoritecentral.com] Im Auftrag von Jeff
> Grossman
> Gesendet: Dienstag, 13. Juli 2010 13:48
> An: meteorite-list at meteoritecentral.com
> Betreff: Re: [meteorite-list] Gebel Kamil iron is official now - 1.6 metric
> tons!?!?
>
> "Ataxite" is a structural term, like octahedrite and hexahedrite.
> Modern classification of iron meteorites is based on the chemical group,
> which can tell you something about the parent asteroid.  The structural
> classification is quasi-independent of the chemical classification,
> inasmuch as members of each structural group can belong to multiple
> chemical groups.  So "ataxite" has not been replaced with "iron,
> ungrouped."  Both are correct.
>
> When I used to edit MetBull, the heading on the description of this
> meteorite would have said "Iron, ataxite (ungrouped)", but other editors
> have abandoned this.
>
> Jeff
>
>
>
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