  Cassiterite.  
Description from the source: 
Cassiterite (Sn O2 tet.), Viloco Mine, La Paz, Bolivia. Good quality crystals. 2,5x2x1 cm; 12 g. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 10 January, 2009 
Text Updated: 10 January, 2009 
Price: Trade 
Size: 1" 
Composition: SnO2
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