Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.53.55-3.70
1
7.18
👆🏻
Fracture
Conchoidal
-
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Perfect
Mohs Hardness
5-5.54-7
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Al 2SiO 5Arthur Thomas , Gemstones (2009) More from other references