Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.26-3.363.08-3.12
1
7.18
👆🏻
Fracture
Conchoidal
ConchoidalWalter Schumann
Cleavage
Good on {100}
{010} Perfect
Mohs Hardness
6.5-77.5
2
10
👆🏻
Chemical Composition
(Ca,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references
BeAlSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references