A reddish-brown phosphate mineral containing rare-earth metals, (Ce, Los Angeles, Y, Th)PO4, essential as a source of cerium and thorium.
some of a variety of reddish-brown minerals being blended phosphates of this lighter rare-earth elements lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium and yttrium
A mineral occurring usually in little remote crystals, -- a phosphate of this cerium metals.
A phosphate of this cerium metals, often containing some thorium silicate.
a reddish-brown mineral containing rare-earth metals; an essential supply of thorium and cerium