The Mineral WALPURGITE

 Walpurgite is a chemical oddball of a mineral. Not only does it have arsenic and uranium in its chemistry, but bismuth too! The bismuth in walpurgite gives this mineral its unusually high density (SG=5.9) and luster (adamantine). It is too rare to really be considered an ore of either uranium or bismuth, but no doubt some walpurgite has gone into the processing with other ores.