  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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