Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.812.72
1
7.18
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Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
-
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
{110} Perfect, {010} Perfect
Mohs Hardness
8.55-6
2
10
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Chemical Composition
BeAl 2 O 4
Na 2ZrSi 3O 9 · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)