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Tortoiseshell
Afghanite
Afghanite and Tortoiseshell Physical Properties


Physical Properties
Tenacity
-  
-  
Solubility
-  
-  
Durability
-  
-  
Specific Gravity
1.25-1.35  
2.55-2.65  
Fracture
-  
Conchoidal  
Cleavage
None  
Perfect {10 1 0}  
Mohs Hardness
-9999  
5.5-6  
Chemical Composition
-  
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)  
Optical Properties >>
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