Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.813.16-3.43
1
7.18
👆🏻
Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Uneven, Conchoidal
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
{110} Good, {110} Good
Mohs Hardness
8.55-6
2
10
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Chemical Composition
BeAl 2 O 4
(Ca,Na)(Mg,Fe,Al)Si 2O 6Anthony et al , Handbook of Mineralogy (2001)