Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.653.69-3.81
1
7.18
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Fracture
Uneven, Conchoidal
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
6-6.58.5
2
10
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Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
BeAl 2 O 4