  Pyrrhotite.
Description from the source:
Pyrrhotite (Fe0.83-1 S hex.), Santa Eulalia, Chihuahua, Mexico. Representative old specimen. 2,2x1,8x1,6 cm; 10 g.
Source: Simone Citon
Contributor: John Gray
Acquired: 26 September, 2008
Text Updated: 28 September, 2008
Price: Trade
Size: 0.85"
Composition: FeS
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