Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
4.00-4.623.69-3.81
1
7.18
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Fracture
Conchoidal, Uneven
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
Indistinct parting on [111]
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
7.5-88.5
2
10
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Chemical Composition
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
BeAl 2 O 4