Tenacity
-
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.50-3.535.5
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
111 (perfect in four directions)
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
105-5.5
2
10
👆🏻
Chemical Composition
C
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references