# Sentence Examples with the word rare earth

The first of the rare earth minerals was discovered in 1794 by Gadolin and was named gadolinite from its discoverer.

GADOLINIUM (symbol Gd., atomic weight 157.3), one of the rare earth metals (see Erbium).

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.