<chemistry> A rare metallic element associated with several other rare elements in the mineral gadolinite from Ytterby in Sweden. Its salts are rose-coloured and give characteristic spectra. Its sesquioxide is called erbia.

Atomic weight: 165.9

Symbol: Er

Origin: NL. From Ytterby, in Sweden, where gadolinite is found. Cf. Terbium, Yttrium, Ytterbium.

(01 Mar 1998)

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