Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.06-5.082.81
1
7.18
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Fracture
Uneven, Subconchoidal, Conchoidal
Conchoidal
Cleavage
Poor on [111].
{001} Perfect
Mohs Hardness
3-3.254.5-5
2
10
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Chemical Composition
Cu5FeS4
NaAl 3(PO 4) 2(OH) 4 · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references