Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.773.69-3.81
1
7.18
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Fracture
Uneven
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
Perfect [001] good [010] poor [110]
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
6-6.58.5
2
10
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Chemical Composition
CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
BeAl 2 O 4