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Coahuila   contributed by Anne Black, IMCA 2356   MetBul Link

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  Iron, IIAB

TKW 2.1 tons. Fall not observed. Found 1837, Coahuila, Mexico.

From The Handbook of Iron Meteorites by Vagn Buchwald (vol. 2, pg. 484, fig. 642):
Etched sections show Coahuila to be a single kamacite crystal, at least as far as sectioning goes. Rhabdites of various sizes are precipitated in crystallographic directions and Neumann bands cross the entire surfaces uniformly.

   


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John Divelbiss
 4/30/2018 10:25:22 AM
I'm not an iron expert or even an novice, but the "single kamacite" crystal statement from Buchwald's book makes me ask the simple question: Is all 2.1 tons (or ~ 9 ft3 = 3' x 3' in size) of this iron from a single kamacite crystal that was several times bigger to start with? If this is true, then what are the limits on the size of single crystal?
Bernd Pauli
 4/30/2018 5:12:20 AM
Coahuila contains ureyite, a chrome pyroxene!
 

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