Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.85-6.152.55-2.65
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Fair in four directions forming octahedrons
Perfect {10 1 0}
Mohs Hardness
3.5-45.5-6
2
10
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Chemical Composition
Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)