Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.06-5.083.16-3.23
1
7.18
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Fracture
Uneven, Subconchoidal, Conchoidal
Conchoidal, Uneven, Conchoidal to uneven
Cleavage
Poor on [111].
[0001] indistinct, [1010] indistinct
Mohs Hardness
3-3.255
2
10
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Chemical Composition
Cu5FeS4
Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references