Tenacity
Brittle
-
Solubility
-
Partly soluble in HCl.
Durability
-
-
Specific Gravity
3.69-3.813.32-3.43
1
7.18
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Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Conchoidal
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
{100} perfect; {110} and {1 1 0} good; {010} poor
Mohs Hardness
8.55.5-6
2
10
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Chemical Composition
BeAl 2 O 4
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references