Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
4.1-4.35.5
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
Indistinct on {011}
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
3.5-45-5.5
2
10
👆🏻
Chemical Composition
CuFeS 2Anthony et al , Handbook of mineralogy (2001)
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references