[meteorite-list] ziz (NWA 854)

From: Metorman46 at aol.com <Metorman46_at_meteoritecentral.com>
Date: Thu, 5 Jun 2008 13:58:59 EDT
Message-ID: <d59.22e89203.35798363_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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Received on Thu 05 Jun 2008 01:58:59 PM PDT