A sample labelled Weibyeite and collected by W.C.Brøgger in 1902 was showed by Sverdrup et al. (1959) to be bastnäsite-(Ce). Sæbø (1963) rexamined Brøggers "Weibyeite" and found it to be a mixture of Ancylite-(Ce) and bastnäsite-(Ce) pseudomorphs after ancylite-(Ce)