Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.52.6-3.3
1
7.18
👆🏻
Fracture
Conchoidal
Lamellar
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Perfect 001
Mohs Hardness
5-5.52-2.5
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6