[meteorite-list] ziz (NWA 854)

[Metorman46 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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