Tenacity
-
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.16-3.436.86-7.03
1
7.18
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Fracture
Uneven, Conchoidal
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
{110} Good, {110} Good
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
5-66-7
2
10
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Chemical Composition
(Ca,Na)(Mg,Fe,Al)Si 2O 6Anthony et al , Handbook of Mineralogy (2001)
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references