Definition that contains rare earth
- la a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth
- ho a trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds
- er a trivalent metallic element of the rare earth group; occurs with yttrium
- pm a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium
- lu a trivalent metallic element of the rare earth group; usually occurs in association with yttrium
- pr a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process
- eu a bivalent and trivalent metallic element of the rare earth group
- nd a yellow trivalent metallic element of the rare earth group; occurs in monazite and bastnasite in association with cerium and lanthanum and praseodymium
- tb a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite
- sm a grey lustrous metallic element of the rare earth group; is used in special alloys; occurs in monazite and bastnasite