Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.643.69-3.81
1
7.18
👆🏻
Fracture
Uneven, Splintery, Conchoidal
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
Absent
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
6.5-78.5
2
10
👆🏻
Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
BeAl 2 O 4