Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.812.59-2.60
1
7.18
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Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
-
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
{001} Perfect, {110} Distinct, {101} Distinct
Mohs Hardness
8.56-7
2
10
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Chemical Composition
BeAl 2 O 4
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)