General Information:
Chemical Formula:Pb2(UO2)(CO3)3
Composition:(Molecular Weight = 864.46 gm)Uranium 27.54 %
U Lead 47.94 %
PbCarbon 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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