Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.53.3-3.5
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Perfect on [110]
Mohs Hardness
5-5.55-6
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
NaNa2(Fe++4Fe+++)Si8O22(OH)2