Tenacity
-
Sectile
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.76-3.776.13
1
7.18
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Fracture
-
Conchoidal
Cleavage
{110} Perfect, {110} Perfect
Distinct on {001} and {110}, indistinct on {100}
Mohs Hardness
5-62-3
2
10
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Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
Pb 2(CO 3)Cl 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references