cumengite

== English == === Etymology === After Edouard Cumenge, French engineer, + -ite === Noun === cumengite (mineralogy) A tetragonal-ditetragonal dipyramidal indigo blue mineral containing chlorine, copper, hydrogen, lead, and oxygen. ==== References ==== David Barthelmy (1997–2026), “Cumengite”, in Webmineral Mineralogy Database.