Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.43-3.443.16-3.43
1
7.18
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Fracture
-
Uneven, Conchoidal
Cleavage
None Observed
{110} Good, {110} Good
Mohs Hardness
6.5-75-6
2
10
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Chemical Composition
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ca,Na)(Mg,Fe,Al)Si 2O 6Anthony et al , Handbook of Mineralogy (2001)