Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.16-3.433.50-3.60
1
7.18
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Fracture
Uneven, Conchoidal
Uneven
Cleavage
{110} Good, {110} Good
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
Mohs Hardness
5-66
2
10
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Chemical Composition
(Ca,Na)(Mg,Fe,Al)Si 2O 6Anthony et al , Handbook of Mineralogy (2001)
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.