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.

Another of bastnaesite has the stated composition (Ce,La)CO3. This sample is from Trimouns talc mine, Luzenac, Ariege, France. Its size is about 3.5x3.5 cm.

Mindat: Bastnaesite

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