Tenacity
-
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
-99996.46-6.57
1
7.18
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Fracture
-
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
-
Good [110] and [021]
Mohs Hardness
-99993-3.5
2
10
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Chemical Composition
SiO2, Al2O3, CaO, MgO, FeO
PbCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references