Mineralogy Database

Cumengite Mineral Data

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General Cumengite Information

Help on Chemical  Formula: Chemical Formula: Cu20Pb21Cl42(OH)40•6H2O
Help on Composition: Composition: Molecular Weight = 7,899.52 gm
   Copper    16.09 %  Cu   20.14 % CuO
   Hydrogen   0.66 %  H     5.93 % H2O
   Lead      55.08 %  Pb   59.34 % PbO
   Chlorine  18.85 %  Cl   18.85 % Cl
               -   %   Cl   -4.25 % -O=Cl2   
   Oxygen     9.32 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu20Pb21Cl42(OH)40•6(H2O)
Help on Environment: Environment: Oxidized zone of sedimentary copper ores associated with boleite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1893
Help on Locality: Locality: Boleo, near Santa Rosalia, Baja California Sur. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Edouard Cumenge (1828-1902), French mining engineer for the Boleo mines.
Help on Synonym: Synonym: Cumengeite