PbFe₃(AsO₄,SO₄)₂(OH)₆

This sample of beudantite is displayed in the Smithsonian Museum of Natural History. Beudantite is a mineral which contains lead and iron and both sulfate and arsenate groups. It has the composition PbFe₃(AsO₄,SO₄)₂(OH)₆. This sample is about 6x6 cm and is from Tsumeb, Namibia. It is described as beudantite with carminite and chalcocite.