  Rheniite.  
Description from the source: 
Rheniite (Re S2 tric.), Vulkan Kudriavy, Iturup, Kurilen, Russia. Dark very lustrous, metallic crust-microcrystals on lava. Extremely rare. 2x1,5x1,5 cm; 3 g. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 28 January, 2009 
Text Updated: 29 January, 2009 
Price: Trade 
Size: 0.75" 
Composition: ReS2
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