The Collaborative International Dictionary
Fluocerite
Fluocerine \Flu`o*ce"rine\, Fluocerite \Flu`o*ce"rite\, n. [Fluo- + cerium.] (Min.) A fluoride of cerium, occuring near Fahlun in Sweden. Tynosite, from Colorado, is probably the same mineral.
Wiktionary
fluocerite
n. (context mineral English) A cerium fluoride mineral found in Sweden.
Wikipedia
Fluocerite
Fluocerite is a mineral, a cerium, lanthanum fluoride, formula (Ce,La)F. It is recognized as two different minerals depending on the cation, fluocerite-(Ce) and fluocerite-(La). Both crystallize in the trigonal system.
Fluocerite-(Ce) was first described (without the Ce) in 1845 from hydrothermal veins in granite in Sweden. Fluocerite-(La) was first described in 1969 from the type locality in central Kazakhstan.