  Ruby Corundum.  
Description from the source: 
Corundum var. Ruby (Al2O3 trig.), Mysore, India. Perfect crystal on matrix. 3,2x2,5x2 cm (up to 14 mm the crystal); 20 g. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 26 September, 2008 
Text Updated: 28 September, 2008 
Price: Trade 
Size: 0.5" 
Composition: Al2O3
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