Atomic_number_65WordNet Explorer

a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite

any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.

a common complex mineral consisting of calcium fluoride phosphate or calcium chloride phosphate; a source of phosphorus

a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium

a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium