Samarskite

Clades: Oxides.
Chemical: (YFe3+Fe2+U,Th,Ca)2(Nb,Ta)2O8; samarskite-(Yb) = (YbFe3+)2(Nb,Ta)2O8; (Y,Fe3+,U)(Nb,Ta)O4.[5].
Crystal system: Orthorhombic.MineralogyRadioactive rare earth mineral.Mineralogy
Samarskite is a radioactive rare earth mineral series which includes samarskite-(Y).