[meteorite-list] ziz (NWA 854)

From: Metorman46 at aol.com <Metorman46_at_meteoritecentral.com>
Date: Tue, 3 Jun 2008 17:45:15 EDT
Message-ID: <cec.34f2f004.3577156b_at_aol.com>

Hello Steve;
 
You asked what is the difference between IAB AND IIAB IRON METEORITES.From
the reading i have done over the eons about iron meteorites my understanding is
 this; IAB is,of course,a coarse octahedrite with a band with of from 1.3 mm
to 3.3 mm,a IIAB is a hexahedrite with a band with of 3.3 mm to 50 mm.The
cooling time of a coarse octahedrite is less than the cooling time for a
hexahedrite which allows for larger crystals to develop in a hexahedrite which
allows a larger band with to form ( widmanstatten pattern ).
 
If you want to really get into studying iron meteorites go to a library and
borrow V.F. BUCHWALDS-HANDBOOK OF IRON METEORITES-There is no better reference
 and study guide on earth concerning iron meteorites.They are also for sale
sometimes on the internet.
 
Iron meteorites are very exciting,i think,and i am glad you think so too.
 
Hope this helps
 
Best Regards;Herman Archer IMCA # 2770



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Received on Tue 03 Jun 2008 05:45:15 PM PDT