Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.27-2.332.90-2.98
1
7.18
👆🏻
Fracture
-
Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
5.5-67.5-8
2
10
👆🏻
Chemical Composition
Na 8Al 6Si 6O 24Cl 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references