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Xenotime :: Xenotime (n.) A native phosphate of yttrium occurring in yellowish-brown tetragonal crystals.

Gadolinium :: Gadolinium (n.) A supposed rare metallic element, with a characteristic spectrum, found associated with yttrium and other rare metals. Its individuality and properties have not yet been determined..

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

Samarskite :: Samarskite (a.) A rare mineral having a velvet-black color and submetallic luster. It is a niobate of uranium, iron, and the yttrium and cerium metals..

Gadolinite :: Gadolinite (n.) A mineral of a nearly black color and vitreous luster, and consisting principally of the silicates of yttrium, cerium, and iron..

Yttro-tantalite :: Yttro-tantalite (n.) A tantalate of uranium, yttrium, and calcium, of a brown or black color..

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..

Decipium :: Decipium (n.) A supposed rare element, said to be associated with cerium, yttrium, etc., in the mineral samarskite, and more recently called samarium. Symbol Dp. See Samarium..

Yttria :: Yttria (n.) The oxide, Y2O3, or earth, of yttrium..

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..

Yttro-cerite :: Yttro-cerite (n.) A mineral of a violet-blue color, inclining to gray and white. It is a hydrous fluoride of cerium, yttrium, and calcium..

Yttriferous :: Yttriferous (a.) Bearing or containing yttrium or the allied elements; as, gadolinite is one of the yttriferous minerals..

Yttrium :: Yttrium (n.) A rare metallic element of the boron-aluminium group, found in gadolinite and other rare minerals, and extracted as a dark gray powder. Symbol Y. Atomic weight, 89..

Yttric :: Yttric (a.) Pertaining to, derived from, or containing, yttrium..

Euxenite :: Euxenite (n.) A brownish black mineral with a metallic luster, found in Norway. It contains niobium, titanium, yttrium, and uranium, with some other metals..

Ittrium :: Ittrium (n.) See Yttrium.

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