Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.43-3.443.69-3.81
1
7.18
👆🏻
Fracture
-
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
None Observed
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
6.5-78.5
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
BeAl 2 O 4