Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.812.90-2.98
1
7.18
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Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Conchoidal, ConchoidalWalter Schumann
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
8.57.5-8
2
10
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Chemical Composition
BeAl 2 O 4
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references