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Cumengeite

Cumengeite, also known as cumengite, is a secondary mineral that was named after mining engineer Bernard Louis Philippe �douard Cumenge, who found the first specimens. It is easily confused with diaboleite. Wikipedia

Crystal system: Tetragonal

Crystal class: Ditetragonal Dipyramidal; H-M Symbol: 4/mmm; (4/m 2/m 2/m)

Formula (repeating unit): Pb21Cu20Cl42(OH)40 � 6H2O