Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
1.98-2.503.69-3.81
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
None
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
5.5-6.58.5
2
10
👆🏻
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
BeAl 2 O 4