  Smithsonite.  
Description from the source: 
Smithsonite (Zn CO3 trig.), Monroe Co., USA. Botryoidal, translucent crystals on matrix. 1,5x1,5x1 cm; 9 g with box. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 26 October, 2008 
Text Updated: 26 October, 2008 
Price: Trade 
Size: 0.6" 
Composition: ZnCO3
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