Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.812.74-2.76
1
7.18
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Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Uneven
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
{010} Perfect, {001} Distinct
Mohs Hardness
8.53.5-4
2
10
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Chemical Composition
BeAl 2 O 4
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)