Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.16-3.433.69-3.81
1
7.18
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Fracture
Uneven, Conchoidal
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
{110} Good, {110} Good
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
5-68.5
2
10
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Chemical Composition
(Ca,Na)(Mg,Fe,Al)Si 2O 6Anthony et al , Handbook of Mineralogy (2001)
BeAl 2 O 4