Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.97-3.032.27-2.33
1
7.18
👆🏻
Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
-
Cleavage
{001} Poor
Perfect
Mohs Hardness
75.5-6
2
10
👆🏻
Chemical Composition
CaB 2(SiO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na 8Al 6Si 6O 24Cl 2Michael OâDonoghue , Gems, Sixth Edition (2006)