Widenmannite

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
More details...