Tenacity
-
-
Solubility
-
-
Durability
-
Hard
Specific Gravity
5.52.67-2.78
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, ConchoidalWalter Schumann
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Imperfect on the [0001]
Mohs Hardness
5-5.57.5-8
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Be3Al2SiO6