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

[Jeff Grossman]

"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

On 7/12/2010 9:48 PM, Galactic Stone & Ironworks wrote:
> Hi List,
>
> The new Egyptian iron is now official and in the Met Bulletin
> database.  Notice the TKW!  1.6 metric tons!  That is a lot of
> fragments.
>
> Also notice the classification type - iron ungrouped.  Not "ataxite".
> Although the write-up does say the meteorite shows an "ataxitic
> structure".
>
> http://tin.er.usgs.gov/meteor/metbull.php?code=52031
>
> Best regards,
>
> MikeG
>
> ------------------------------------------------------------
> Mike Gilmer - Galactic Stone&  Ironworks Meteorites
> http://www.galactic-stone.com
> http://www.facebook.com/galacticstone
> ------------------------------------------------------------
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