  Molybdenite.  
Description from the source: 
Molybdenite (Mo S2 hex.), Getchell Mine, Humboldt Co., Nevada, USA. Lustrous crystals on matrix with Epidote. 6,5x4,5x3 cm; 105 g. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 30 September, 2008 
Text Updated: 1 October, 2008 
Price: Trade 
Size: 2.5" 
Composition: MoS2
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