Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.816.30-6.39
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}
[001] good, [210] distinct
Mohs Hardness
8.53-3.5
2
10
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Chemical Composition
BeAl 2 O 4
PbSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references