Tenacity
-
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.16-3.436.46-6.57
1
7.18
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Fracture
Uneven, Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
{110} Good, {110} Good
Good [110] and [021]
Mohs Hardness
5-63-3.5
2
10
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Chemical Composition
(Ca,Na)(Mg,Fe,Al)Si 2O 6Anthony et al , Handbook of Mineralogy (2001)
PbCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references