Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
-99992.97-3.03
1
7.18
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Fracture
-
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
-
{001} Poor
Mohs Hardness
-99997
2
10
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Chemical Composition
SiO2, Al2O3, CaO, MgO, FeO
CaB 2(SiO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references