Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.16-3.436.50-7.00
1
7.18
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Fracture
Uneven, Conchoidal
Irregular, Conchoidal
Cleavage
{110} Good, {110} Good
On {011}, distinct; on {001}, {013}, indistinct
Mohs Hardness
5-63
2
10
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Chemical Composition
(Ca,Na)(Mg,Fe,Al)Si 2O 6Anthony et al , Handbook of Mineralogy (2001)
PbMoO 4Walter Schumann , Gemstones of the world (2001)