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Erbium :: Erbium (n.) A rare metallic element associated with several other rare elements in the mineral gadolinite from Ytterby in Sweden. Symbol Er. Atomic weight 165.9. Its salts are rose-colored and give characteristic spectra. Its sesquioxide is called erbia.

Fergusonite :: Fergusonite (n.) A mineral of a brownish black color, essentially a tantalo-niobate of yttrium, erbium, and cerium; -- so called after Robert Ferguson..

Terbic :: Terbic (a.) Of, pertaining to, or containing, terbium; also, designating certain of its compounds..

Terbium :: Terbium (n.) A rare metallic element, of uncertain identification, supposed to exist in certain minerals, as gadolinite and samarskite, with other rare ytterbium earth. Symbol Tr or Tb. Atomic weight 150..

Gadolinia :: Gadolinia (n.) A rare earth, regarded by some as an oxide of the supposed element gadolinium, by others as only a mixture of the oxides of yttrium, erbium, ytterbium, etc..

Ytterbic :: Ytterbic (a.) Pertaining to, or derived from, ytterbium; containing ytterbium..

Ytterbium :: Ytterbium (n.) A rare element of the boron group, sometimes associated with yttrium or other related elements, as in euxenite and gadolinite. Symbol Yb; provisional atomic weight 173.2. Cf. Yttrium..

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