General Information:
Chemical Formula:
Pb2(UO2)(CO3)3
Composition:
(Molecular Weight = 864.46 gm)
Uranium 27.54 % U
Lead 47.94 % Pb
Carbon 4.17 % C
Oxygen 20.36 % O
Empirical Formula:
Pb2(UO2)(CO3)3
Environment:
Alteration zone mineral.
Locality:
Michael mine, Weiler bei Lehr, Schwarzwald, Germany.
Name Origin:
Named for Bergrat J. F. Widenmann (1764-1798), who first discovered uranium containing micas in the Schwarzwald.
Physical Properties:
Cleavage:
[100] Perfect
Color:
light yellow.
Density:
6.89
Habits:
Tabular - Form dimensions are thin in one direction., ,
Hardness:
2 - Gypsum
Luminescence:
Non-fluorescent.
Luster:
Silky - Pearly
Streak:
white
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