Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.813.25-3.50
1
7.18
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Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Conchoidal, Fibrous
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
{001} perfect and {100} imperfect
Mohs Hardness
8.56-7
2
10
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Chemical Composition
BeAl 2 O 4
CaAl 2(Fe3+ ,Al)Si 3O 12(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references