Lanthanite is a radioactive mineral, a carbonate of the rare earth elements lanthanum, cerium and neodymium with formula: (La,Ce,Nd)2(CO3)3·8(H2O). It is officially known as three separate minerals lanthanite-Ce, lanthanite-La and lanthanite-Nd based on the dominant rare earth element. Some samples of the mineral may also contain dysprosium. It i... Found on http://en.wikipedia.org/wiki/Lanthanite