Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.811.98-2.50
1
7.18
👆🏻
Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
ConchoidalWalter Schumann
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
None
Mohs Hardness
8.55.5-6.5
2
10
👆🏻
Chemical Composition
BeAl 2 O 4
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)