Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.813.22-3.40
1
7.18
👆🏻
Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Conchoidal
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
Perfect
Mohs Hardness
8.55-6
2
10
👆🏻
Chemical Composition
BeAl 2 O 4
(Ca,Mg,Mn)SiO 3Gemdat.org , Management Team (2012)