DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Mottramite, a hydrated lead copper vanadinite, an orthorhombic mineral with chemical formula PbCu(VO4)(OH). It is copper rich and usually occurs as botryoidal crusts coloured green to blue to grey. From Tsumeb, Namibia. Width 70mm.
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