"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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