Tenacity
Brittle
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.69-3.816.86-7.03
1
7.18
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Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
8.56-7
2
10
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Chemical Composition
BeAl 2 O 4
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references