Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.20-3.323.69-3.81
1
7.18
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Fracture
Uneven, Conchoidal
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
Poor
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
6-6.58.5
2
10
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Chemical Composition
(Mg,Fe2+ ) 7(SiO 4) 3(F,OH) 2Anthony et al , Handbook of mineralogy (2001)
BeAl 2 O 4