noun euxenite a rare brownish-black mineral containing erbium, cerium, uranium, columbium, and yttrium 0
noun euxenite a dark-colored, hard, orthorhombic mineral, (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6, containing oxides of several chemical elements, esp. of calcium, uranium, titanium, and certain rare-earth elements 0
