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{n: gadolinite, ytterbite} a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium

{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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