Tenacity
-
Brittle
Solubility
insoluble in common solvents
-
Durability
-
-
Specific Gravity
2.653.69-3.81
1
7.18
👆🏻
Fracture
Conchoidal, ConchoidalWalter Schumann
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
Indiscernible
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
78.5
2
10
👆🏻
Chemical Composition
SiO2
BeAl 2 O 4