Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.813.84
1
7.18
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Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Subconchoidal, Conchoidal
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
{0001} good, {10 1 0} parting
Mohs Hardness
8.57.5-8
2
10
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Chemical Composition
BeAl 2 O 4
(Ca,Ce)(Al,Ti,Mg)12O19