Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.25-2.405.5
1
7.18
👆🏻
Fracture
-
Conchoidal
Cleavage
perfect on {010}; good on {100}
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
5-5.55-5.5
2
10
👆🏻
Chemical Composition
NaCa 2Al 5Si 5O 20 · 6H 2OMichael 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