Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.50-3.603.69-3.81
1
7.18
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Fracture
Uneven
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
68.5
2
10
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Chemical Composition
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.
BeAl 2 O 4