Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.30-2.605.5
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
{111} Imperfect
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
5.5-65-5.5
2
10
👆🏻
Chemical Composition
Na 4AlBeSi 4O 12ClMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references