Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.28-3.382.90-2.98
1
7.18
👆🏻
Fracture
Splintery, Fibrous
Conchoidal, ConchoidalWalter Schumann
Cleavage
Good on [110]
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
6.5-77.5-8
2
10
👆🏻
Chemical Composition
NaAlSi 2O 6Ulrich Henn and Claudio C.
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references