Tenacity
-
-
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
5.52.51-2.63
1
7.18
👆🏻
Fracture
Conchoidal
Fibrous
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Perfect basal
Mohs Hardness
5-5.52.5-4.5
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Mg 3(Si 2O 5)(OH) 4Gemdat.org , Management Team (2012)