Tenacity
-
-
Solubility
insoluble
-
Durability
-
-
Specific Gravity
6.46-6.573.32-3.43
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Conchoidal
Cleavage
Good [110] and [021]
Poor on {110} and {100} very poor on {001}
Mohs Hardness
3-3.56-7
2
10
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Chemical Composition
PbCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4