RhymeZone: euxenite definitions

Definitions of euxenite:

noun: (mineralogy) A dark brown lustrous mineral that is a mixed oxide of cerium, erbium, titanium, uranium, yttrium and other more common metals, with the chemical formula (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆.

(Definitions from Wiktionary)