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Cumengite: Cu20Pb21Cl42(OH)40·6H2O Boleite: KPb26Ag9Cu24Cl62(OH)48
Comments: Inky blue cumengite "sixling" epitaxially overgrown on boleite. Location: Amelia mine, Santa Rosalia, Baja California Sur, Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals