Demesmaekerite

General Information:
 Chemical Formula:
Pb2Cu5(UO2)2(SeO3)6(OH)6·2(H2O)
 Composition:
(Molecular Weight = 2,172.01 gm)
Uranium 21.92 % U 
Copper 14.63 % Cu
Hydrogen 0.46 % H 
Lead 19.08 % Pb
Selenium 21.81 % Se
Oxygen 22.10 % O 
 Empirical Formula:
Pb2Cu5(UO2)2(SeO3)6(OH)6·2(H2O)
 Environment:
Lower part of the oxidation zone.
 IMA Status:
Approved IMA 1965
 Locality:
Musonoi mine, Kolwezi, Shaba, Zaire.
 Name Origin:
Named for Gaston Demesmaeker (1911-), Belgian mining geologist, who studied the Shikolobwe uranium deposits.
Physical Properties:
 Cleavage:
None
 Color:
brown, brownish green, green, or bottle green.
 Density:
5.28
 Habits:
Aggregates - Made of numerous individual crystals or clusters., ,
 Hardness:
3-4 - Calcite-Fluorite
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