  Vesuvianite.  
Description from the source: 
Vesuvianite (Ca10 Mg2 Al4 (SI O4)5 (Si2 O7)2 (OH)4 tet.), Bellecombe, Aosta, Italia. Perfect isolated crystal. 1,2x0,8x0,8 cm; 3 g. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 30 September, 2008 
Text Updated: 1 October, 2008 
Price: Trade 
Size: 0.5" 
Composition: Ca10Mg2Al4(SiO4)5(Si2O7)2(OH)4
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