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 %
CuHydrogen 0.46 %
H Lead 19.08 %
PbSelenium 21.81 %
SeOxygen 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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