Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.52.90-3.14
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal, Uneven
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Imperfect; basal
Mohs Hardness
5-5.57.5-8
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Be,Cs) 3Al 2Si 6O 18 · 0.5H 2OUlrich Henn and Claudio C.