Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.52.48
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Perfect on {001}
Mohs Hardness
5-5.52
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
NaCa16Si23AlO60(OH)8•64(H2O)