General Information:
Chemical Formula:
Pb2OCO3
Composition:
(Molecular Weight = 490.41 gm)
Lead 84.50 % Pb
Carbon 2.45 % C
Oxygen 13.05 % O
Empirical Formula:
Pb2O(CO3)
Environment:
In silicified breccia.
IMA Status:
Approved IMA
Locality:
Grand Reef mine, Graham County, Arizona, USA.
Name Origin:
For David M. Shannon (1942- ), a mineral dealer who helped collect the first samples of the mineral.
Physical Properties:
Cleavage:
None
Color:
white.
Density:
9.31
Diaphaniety:
Opaque
Habits:
Porcelainous - Fine-grained, translucent massive material like broken china, Encrustations - Forms crust-like aggregates on matrix., Platy - Sheet forms (e.g. micas).
Hardness:
3-3.5 - Calcite-Copper Penny
Luminescence:
Non-fluorescent.
Luster:
Waxy
Streak:
white
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