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Covellite
Covellite

Afghanite
Afghanite



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Afghanite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Flexible
-
-
4.6-4.76
-
Perfect on {0001}
-9999
CuSMichael O’Donoghue , Gems, Sixth edition (2006) More from other references
 
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-
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2.55-2.65
Conchoidal
Perfect {10 1 0}
5.5-6
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)