  Lepidolite.  
Description from the source: 
Lepidolite (K (Li Al)3 (Si Al)4 O10 (F OH)2 mon.), Aracuai`, Minas Gerais, Brazil. Little crystals on clear Quartz. 1,2x0,8x0,8 cm: 1 g. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 10 January, 2009 
Text Updated: 10 January, 2009 
Price: Trade 
Size: 0.5" 
Composition: K(Li,Al)3(Si,Al)4O10(F,OH)2
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