Rare-earth-metals sentence example

rare-earth-metals
  • It combines directly with lithium, calcium and magnesium when heated, whilst nitrides of the rare earth metals are also produced when their oxides are mixed with magnesium and heated in a current of nitrogen (C. Matignon, Comptes rendus, 1900, 131, p. 837).
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  • The rare earth metals are found in the minerals gadolinite, samarskite, fergusonite, euxenite and cerite.
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