cumengite

noun
cu·​men·​gite
variants: or less commonly cumengeite \ kyüˈmenˌjīt, -​ˌgīt \
plural -s

Definition of cumengite 

: a mineral Pb4Cu4Cl8(OH)8.H2O consisting of a basic lead-copper chloride occurring in deep blue tetragonal crystals

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History and Etymology for cumengite

German cumengit, from Édouard Cumenge †1902 French mining engineer + German -it -ite

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