Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.652.32-2.38
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
ConchoidalWalter Schumann
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
None
Mohs Hardness
6-6.55.5
2
10
👆🏻
Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
SiO 2(+Al 2O 3)Walter Schumann , Gemstones of the world (2001)