Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.53.28-3.31
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
None observed
Mohs Hardness
5-5.56.5-7.5
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Al 6B 5O 15(F,OH) 3Ulrich Henn and Claudio C.