Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.812.64-2.69
1
7.18
👆🏻
Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
-
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
None
Mohs Hardness
8.57
2
10
👆🏻
Chemical Composition
BeAl 2 O 4
SiO 2Michael OâDonoghue , Gems, Sixth Edition (2006)