Lepersonnite-(Gd)
Lepersonnite- is a very rare rare-earth and uranium mineral with the formula Ca2244824·48H2O. It occurs associated with bijvoetite- in the Shinkolobwe deposit in the Democratic Republic of the Congo, famous for rare uranium minerals. Lepersonnite- is unique in being the only confirmed mineral with essential gadolinium.[Gadolinium: The mineralogy of gadolinium - Mindat. org ]