Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.814.76-5.03
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}
None
Mohs Hardness
8.55.5-6.5
2
10
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Chemical Composition
BeAl 2 O 4
(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)