Fluocerite is a mineral of cerium fluorides , chemical formula (Ce,La)F 3. The end members are classified as two different mineral types depending on the cation , fluocerite-(Ce) and fluocerite-(La), corresponding respectively to lanthanum trifluoride and cerium trifluoride. Both crystallize in the trigonal system.
Fluocerite-(Ce) was first described (without the Ce) in 1845 from hydrothermal. Fluocerite-(La) was first described in 1969 from the type locality.