Mawbyite is a lead iron zinc arsenate, dimorphous with carminite, and a member of the Tsumcorite Group. It is named for Sir Maurice Mawby, for his contribution to the Australian mining industry and the preservation of Broken Hill, Australia, minerals. Mawbyite occurs as transparent to translucent, pale orange, orange-brown to reddish-brown, prismatic  crystals exhibiting an adamantine luster; crystals occur as druses, crusts, and sheaf-like aggregates. It is found in cavities in the oxidization zone of a metamorphosed stratiform Pb–Zn orebody at Broken Hill, Yancowinna Co., New South Wales, Australia (type locality), associated with corkite–beudantite, duftite, adamite–olivenite, bayldonite, hidalgoite, pharmacosiderite, segnitite, and Fe–Mn oxides. Mawbyite is also found in the oxidization zone of Ag–Pb–Cu–Bi ores in fluorite–barite–quartz veins with mimetite, philipsbornite, and thometzekite, at Moldova, Czech Republic.
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