Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.74-2.902.90-2.98
1
7.18
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Fracture
Uneven, Splintery
Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect on {100} and {001}
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
4.5-57.5-8
2
10
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Chemical Composition
Ca 2NaHSi 3O 9Ulrich Henn and Claudio C.
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references