  Pyrargyrite.  
Description from the source: 
Pyrargyrite (Ag3 SbS3 trig.), San Genaro, Castrovvirreyna, Peru. Similar (distinct geminated crystals). 1,4x1x1 cm; 5 g with box. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 30 September, 2008 
Text Updated: 30 September, 2008 
Price: Trade 
Size: 0.5" 
Composition: Ag3SbS3
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