Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.51.98-2.25
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
None
Mohs Hardness
5-5.55-6.5
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SiO 2 + H 2OUlrich Henn and Claudio C.