Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-2.983.28-3.38
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Splintery, Fibrous
Cleavage
Distinct on {11 2 0}, imperfect on {10 1 1}
Good on [110]
Mohs Hardness
7.5-86.5-7
2
10
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Chemical Composition
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
NaAlSi 2O 6Ulrich Henn and Claudio C.