“…Similarly, Zaitsev et al 39 found that cerianite formed during the alteration of apatite as a result of carbonate weathering precipitated from groundwater. Moore et al 40 reported cerianite in Bear Lodge carbonatite, Wyoming, USA, that partially replaced early-crystallised ancylite and fluorocarbonates; they also observed Ce-depleted monazite in association with cerianite at certain localities. Van Rythoven et al , 38 studied the same carbonatite and found that hydrothermally-altered carbonatite with unoxidized REEs occurs primarily as ancylite and parisite-synchysite, while monazite, bastnasite, and cerianite were labeled as subordinate minerals, broken down by supergene oxidation.…”