Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.27-2.333.19-3.56
1
7.18
👆🏻
Fracture
-
Uneven, Conchoidal
Cleavage
Perfect
{110} Perfect, {010} Indistinct
Mohs Hardness
5.5-65.5-6
2
10
👆🏻
Chemical Composition
Na 8Al 6Si 6O 24Cl 2Michael OâDonoghue , Gems, Sixth Edition (2006)
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)