  Huebnerite.  
Description from the source: 
Huebnerite (Mn+2 WO4 mon.), Huayllapon Mine, Pasto Bueno, Ancash, Peru. Very nice biterminated crystal, black reddish, with Quartz, high lustre. 6,5x3,5x1,8 cm; 82 g. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 26 October, 2008 
Text Updated: 16 March, 2009 
Price: Trade 
Size: 2.5" 
Composition: MnWO4
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