Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.08-3.125.5
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Conchoidal
Cleavage
{010} Perfect
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
7.55-5.5
2
10
👆🏻
Chemical Composition
BeAlSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references