Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.213.69-3.81
1
7.18
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Fracture
Uneven, Subconchoidal, Splintery
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
Good on {110}, poor on {100}
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
7.58.5
2
10
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Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
BeAl 2 O 4