Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.812.98-3.10
1
7.18
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Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Sub-Conchoidal, Irregular/uneven, Uneven, Conchoidal
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
[100] Perfect, [110] Good, [011] Distinct
Mohs Hardness
8.56
2
10
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Chemical Composition
BeAl 2 O 4
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references