Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
5.54.1-4.3
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Indistinct on {011}
Mohs Hardness
5-5.53.5-4
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CuFeS 2Anthony et al , Handbook of mineralogy (2001)