  Danburite.  
Description from the source: 
Danburite (Ca B2 (SiO4)2 orth.), Charcas, San Luis Potosi`, Mexico. Prismatic, geminated, partially translucent, good. 6,5x2x1,5 cm; 25 g. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 28 January, 2009 
Text Updated: 29 January, 2009 
Price: Trade 
Size: 2.6" 
Composition: CaB2(SiO4)2
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