Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.812.65
1
7.18
👆🏻
Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Conchoidal, ConchoidalWalter Schumann
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
3,1
Mohs Hardness
8.57
2
10
👆🏻
Chemical Composition
BeAl 2 O 4
SiO 2Ulrich Henn and Claudio C.