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{n: terbium, Tb, atomic number 65} a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite

{n: thulium, Tm, atomic number 69} a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime

{n: xenotime} a brown-to-yellow mineral that is a phosphate of yttrium in crystalline form

{n: ytterbium, Yb, atomic number 70} a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime

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