Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.53.0-3.1
1
7.18
👆🏻
Fracture
Conchoidal
-
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Perfect on {001}
Mohs Hardness
5-5.53.5
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca(Mg,Al)3(Al3Si)O10(OH)2