  Livingstonite.  
Description from the source: 
Livingstonite (Hg Sb4 S8 mon.), Municipio de Huitzuco, Guerrero, Mexico. Rare masses or micro acicular crystals on Anhydrite matrix. 3x2x2 cm; 12 g. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 11 March, 2009 
Text Updated: 12 March, 2009 
Price: Trade 
Size: 1.2" 
Composition: HgSb4S8
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