Tenacity
Brittle
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
5.06-5.083.25-3.35
1
7.18
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Fracture
Uneven, Subconchoidal, Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
Poor on [111].
Perfect in three directions
Mohs Hardness
3-3.255
2
10
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Chemical Composition
Cu5FeS4
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references