Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.06-5.083.05-3.21
1
7.18
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Fracture
Uneven, Subconchoidal, Conchoidal
Uneven, Subconchoidal, Splintery
Cleavage
Poor on [111].
Good on {110}, poor on {100}
Mohs Hardness
3-3.257.5
2
10
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Chemical Composition
Cu5FeS4
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references