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