Quenselite

General Information:
 Chemical Formula:
PbMn+++O2(OH)
 Composition:
(Molecular Weight = 311.14 gm)
Manganese 17.66 % Mn
Hydrogen 0.32 % H 
Lead 66.59 % Pb
Oxygen 15.43 % O 
 Empirical Formula:
PbMn3+O2(OH)
 Environment:
In iron ore associated with calcite and barite.
 Locality:
Langbanshyttan, Vermland, Sweden.
Physical Properties:
 Cleavage:
[001] Perfect
 Color:
pitch black.
 Density:
6.842
 Diaphaniety:
Opaque
 Hardness:
2.5 - Finger Nail
 Luster:
Earthy (Dull)
 Streak:
dark brownish gray
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