  Niccolite.  
Description from the source: 
Niccolite, Arsen (Ni As hex.), Yachymov (ex Joachimstal), Boemia, Czech Republic. Very nice crystal sections, gray yellowish with a bit of pinkish, on massive Arsen. Present a light green patina of the rare Bismite. 3,2x2x1 cm; 10 g. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 30 September, 2008 
Text Updated: 1 October, 2008 
Price: Trade 
Size: 1.25" 
Composition: NiAs
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