Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.20-2.265.5
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
Perfect on {110}
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
5-5.55-5.5
2
10
👆🏻
Chemical Composition
Na 2[Al 2Si 3O 10] · 2H 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