| (Ce,La,Y)CO3(F,OH)
This sample of bastnaesite is displayed in the Smithsonian Museum of Natural History. Bastnaesite is a carbonate compound of cerium, lanthanum and yttrium with the composition (Ce,La,Y)CO3(F,OH). The sample at left is about 10x30 cm and is from Ambatafangshana, Madagascar.
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