W. C. Brøgger (1890) described weibyeite as a new fluo-carbonate of Ce and La from a nepheline syenite pegmatite at the island Øvre Arø in the Langesundsfjord, Southern Norway. The original material has been re-examined by optical and X-ray powder methods. Weibyeite is bastnaesite pseudomorphs after ancylite and very rarely also after zircon, together with minor amounts of ancylite. Weibyeite is hereby discredited as a mineral species.
Contributions to the mineralogy of Norway. No. 20. The identity of Weibyeite.