Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.06-5.083.26-3.36
1
7.18
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Fracture
Uneven, Subconchoidal, Conchoidal
Conchoidal
Cleavage
Poor on [111].
Good on {100}
Mohs Hardness
3-3.256.5-7
2
10
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Chemical Composition
Cu5FeS4
(Ca,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references