Citation: Mazzi, F.; Munno, R. (1983). Calciobetafite (new mineral of the pyrochlore group) and related minerals from Campi Flegrei, Italy; crystal structures of polymignyte and zirkelite: comparison with pyrochlore and zirconolite Note: polytype zirconolite-3O Locality: Campi Flegrei, Italy. American Mineralogist, 68, pp. 262-276.