The occurence of plumbonacrite, and possibly somersetite, at the Långban deposit has been verified by powder X-ray diffraction and chemical point analysis (EDS). The minerals are intergrown with hydrocerussite, and coexisting minerals on the crack surface of the specimen, a pinkish carbonate rock with mica, chlorite and minor oxides, are sahlinite, native lead, pyrochroite, calcite and baryte.