Hydroxylbastnäsite-(Ce)
Hydroxylbastnäsite-(Ce) is an IMA-recognized mineral species in the carbonate class, with the chemical formula Ce(CO₃)(OH).
It crystallizes in the hexagonal crystal system (space group P-6). It is a member of the Bastnäsite structural group.
Key properties: Mohs hardness 4; specific gravity 4.745; Vitreous to greasy luster; optically uniaxial.
IMA symbol Hbsn-Ce, IMA status: approved, named in 1964.
Found in calcite–dolomite carbonatite veins in pyroxenite of an alkalic ultramafic complex (Vuoriyarvi complex, Kola Peninsula, Russia); in a vug in perthitic pegmatite (Kamihori, Japan); in veins and lenses in marble (Desmont mine.
It is found associated with Barite, strontianite, ancylite, fluorite, pyrrhotite, pyrite, chalcopyrite, magnetite, anatase, monazite, burbankite, quartz (Vuoriyarvi complex.
The name refers to a member of the bastnäsite group with (OH)1− > F1− and with cerium the dominant rare earth element.