Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.813.08-3.12
1
7.18
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Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
ConchoidalWalter Schumann
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
{010} Perfect
Mohs Hardness
8.57.5
2
10
👆🏻
Chemical Composition
BeAl 2 O 4
BeAlSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references