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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.

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

Cerium oxide, CeO2, a white infusible substance constituting about one per cent of the material of the common incandescent mantle.

mineral of a brownish of cherry-red color, commonly massive. It is a hydrous silicate of cerium and allied metals.

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.

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.

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.

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

A fluoride of cerium, occuring near Fahlun in Sweden. Tynosite, from Colorado, is probably the same mineral.

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

te, 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. [Formerly written also lanthanium.]

A mineral occurring usually in small isolated crystals, -- phosphate of the cerium metals.

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.

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

and the West Indies. -- Stag-horn fern (Bot.), an Australian and West African fern (Platycerium alcicorne) having the large fronds branched like a stag's horns; also, any species of the same genus. -- Stag-horn sumac (Bot.), a common American shrub (Rhus typhina) having densely velvety branchlets. See Sumac. -- Stag…

A fluoride of the cerium metals occurring in hexagonal crystals of a pale yellow color. Cf. Fluocerite.

eria. The mantle is made by soaking a "stocking" in a solution of nitrates of thorium and cerium (approx. 99 : 1), drying, and, for use, igniting to burn the thread and convert the nitrates into oxides, which remain as a fragile ash. The light far exceeds that obtained from the same amount of gas with the ordinary fish…

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