Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.813.87-4.14
1
7.18
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Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Subconchoidal, Conchoidal
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
Poor on {120}, in traces on {001}
Mohs Hardness
8.55.5-6
2
10
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Chemical Composition
BeAl 2 O 4
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references