Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.653.69-3.81
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
3,1
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
78.5
2
10
👆🏻
Chemical Composition
SiO 2Ulrich Henn and Claudio C.
BeAl 2 O 4