Tenacity
-
-
Solubility
insoluble
-
Durability
-
-
Specific Gravity
6.46-6.573.76-3.77
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
-
Cleavage
Good [110] and [021]
{110} Perfect, {110} Perfect
Mohs Hardness
3-3.55-6
2
10
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Chemical Composition
PbCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.