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Didymium :: Didymium (n.) A rare metallic substance usually associated with the metal cerium; -- hence its name. It was formerly supposed to be an element, but has since been found to consist of two simpler elementary substances, neodymium and praseodymium. See Neodymium, and Praseodymium..

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

Allanite :: Allanite (n.) A silicate containing a large amount of cerium. It is usually black in color, opaque, and is related to epidote in form and composition..

Eschynite :: Eschynite (n.) A rare mineral, containing chiefly niobium, titanium, thorium, and cerium. It was so called by Berzelius on account of the inability of chemical science, at the time of its discovery, to separate some of its constituents..

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..

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..

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

Lanthanum :: Lanthanum (n.) A rare element of the group of the earth metals, allied to aluminium. It occurs in certain rare minerals, as cerite, gadolinite, orthite, etc., and was so named from the difficulty of separating it from cerium, didymium, and other rare elements with which it is usually associated. Atomic weight 138.5. Symbol La..

Pyrochlore :: Pyrochlore (n.) A niobate of calcium, cerium, and other bases, occurring usually in octahedrons of a yellowish or brownish color and resinous luster; -- so called from its becoming grass-green on being subjected to heat under the blowpipe..

Monazite :: Monazite (n.) A mineral occurring usually in small isolated crystals, -- a phosphate of the cerium metals..

Fluocerite :: Fluocerite (n.) A fluoride of cerium, occuring near Fahlun in Sweden. Tynosite, from Colorado, is probably the same mineral..

Cerium :: Cerium (n.) A rare metallic element, occurring in the minerals cerite, allanite, monazite, etc. Symbol Ce. Atomic weight 141.5. It resembles iron in color and luster, but is soft, and both malleable and ductile. It tarnishes readily in the air..

Cerite :: Cerite (n.) A mineral of a brownish of cherry-red color, commonly massive. It is a hydrous silicate of cerium and allied metals..

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..

Tysonite :: Tysonite (n.) A fluoride of the cerium metals occurring in hexagonal crystals of a pale yellow color. Cf. Fluocerite.

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