Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.19-3.562.90-2.98
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
{110} Perfect, {010} Indistinct
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
5.5-67.5-8
2
10
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Chemical Composition
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references