Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.97-3.033.76-3.77
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
-
Cleavage
{001} Poor
{110} Perfect, {110} Perfect
Mohs Hardness
75-6
2
10
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Chemical Composition
CaB 2(SiO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.