Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.812.97-3.03
1
7.18
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Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
{001} Poor
Mohs Hardness
8.57
2
10
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Chemical Composition
BeAl 2 O 4
CaB 2(SiO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references