A mineral consisting of a fluoride of cerium and lanthanum (in varying proportions), typically occurring as brownish-yellow prisms or polycrystalline masses.
Chemical formula: (Ce,La)F₃. Crystal system: hexagonal.
Mid 19th century; earliest use found in Charles Shepard (1804–1886). From German Fluocerit (in neutraler Fluocerit C. F. A. HartmannLehrbuch der Mineral. u. Geol I. 227; see below, and compare †Flußcerit, †Ceriumfluat (both 1831 or earlier)) from fluo- + cer- (in Cerium) + -it, after French flucérine. Compare French fluocérite.