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Noun
gadolinite
ytterbite
Definition: a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium
Definition: A dark, vitreous mineral that is a complex mixture of silicates of cerium, lanthanum, neodymium, yttrium, beryllium, and iron, with the chemical formula (Ce,La,Nd,Y)₂FeBe₂Si₂O₁₀.