Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.815.9-6.3
1
7.18
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Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Conchoidal, Uneven
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Mohs Hardness
8.54.5-5
2
10
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Chemical Composition
BeAl 2 O 4
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references