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Polyhalite
Sanidine
Sanidine and Polyhalite Physical Properties


Physical Properties
Tenacity
Brittle  
-  
Solubility
Soluble  
-  
Durability
-  
-  
Specific Gravity
2.78  
2.54-2.61  
Fracture
Conchoidal  
Uneven  
Cleavage
Perfect on {10 1 }; parting on {010}  
{001} Perfect, {010} Good  
Mohs Hardness
3.5  
6  
Chemical Composition
K2Ca2Mg(SO4)4·2H2O  
KAlSi 3O 8Michael O’Donoghue , Gems, Sixth Edition (2006)  
Optical Properties >>
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