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Afghanite
Faustite
Faustite and Afghanite Physical Properties


Physical Properties
Tenacity
-  
-  
Solubility
-  
-  
Durability
-  
-  
Specific Gravity
2.55-2.65  
2.9  
Fracture
Conchoidal  
Conchoidal  
Cleavage
Perfect {10 1 0}  
{???} Indistinct  
Mohs Hardness
5.5-6  
4.5  
Chemical Composition
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)  
(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael O’Donoghue , Gems, Sixth Edition (2006)  
Optical Properties >>
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