Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.485.5
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
Perfect on {001}
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
25-5.5
2
10
👆🏻
Chemical Composition
NaCa16Si23AlO60(OH)8•64(H2O)
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references