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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. [Written also ittrium.]

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.

ish black mineral with a metallic luster, found in Norway. It contains niobium, titanium, yttrium, and uranium, with some other metals.

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

an oxide of the supposed element gadolinium, by others as only a mixture of the oxides of yttrium, erbium, ytterbium, etc.

a nearly black color and vitreous luster, and consisting principally of the silicates of yttrium, cerium, and iron.

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.

See Yttrium.

ng a velvet-black color and submetallic luster. It is a niobate of uranium, iron, and the yttrium and cerium metals.

ookes in 1898. Its nitrate is obtained byy practical decomposition and crystallization of yttrium nitrate. At. wt., about 117.

A native phosphate of yttrium occurring in yellowish-brown tetragonal crystals.

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.

The oxide, Y2O3, or earth, of yttrium.

Pertaining to, derived from, or containing, yttrium.

Bearing or containing yttrium or the allied elements; as, gadolinite is one of the yttriferous minerals.

of a violet-blue color, inclining to gray and white. It is a hydrous fluoride of cerium, yttrium, and calcium.

A tantalate of uranium, yttrium, and calcium, of a brown or black color.