[meteorite-list] ziz (NWA 854)

[Metorman46 at aol.com]

In a message dated 6/3/2008 4:45:15 PM Eastern  Standard Time, Metorman46 
writes:
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 bandwidth of from 1.3 mm 
to 3.3 mm,a IIAB is a  hexahedrite with a bandwidth 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 bandwidth 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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