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composition, in part, of rocks containing aluminous minerals, as granite. Lime, magnesia, oxide of iron, and other ingredients, are often present as impurities.

A scale of oxide of iron, formed in forging.

t glance. (Min.) See Cobaltite. -- Cobalt green, a pigment consisting essentially of the oxides of cobalt and zinc; -- called also Rinman's green. -- Cobalt yellow (Chem.), a yellow crystalline powder, regarded as a double nitrite of cobalt and potassium.

t; -- said especially of those compounds in which cobalt has higher valence; as, cobaltic oxide. Luteo-cobaltic compounds (Chem.), an extensive series of complex yellow compounds of ammonia and cobaltic salts. -- Roseo-cobaltic compounds (Chem.), an extensive series of complex red compounds of cobalt and ammonia. Modi…

Polishing rouge; a reddish brown oxide of iron, used in polishing glass, and also as a pigment; -- called also crocus Martis.

um or niobium; niobic. Columbic acid (Chem.), a weak acid derived from columbic or niobic oxide, Nb2O5; -- called also niobic acid.

) A scum of calcium carbonate which forms on a solution of milk of lime from the carbon dioxide of the air. (b) A thick creamy emulsion of lime in water. -- Cream of tartar (Chem.), purified tartar or argol; so called because of the crust of crystals which forms on the surface of the liquor in the process of purificat…

o blue asbestus. A silicified form, in which the fibers penetrating quartz are changed to oxide of iron, is the yellow brown tiger-eye of the jewelers.

A deep yellow powder; the oxide of some metal calcined to a red or deep yellow color; esp., the oxide of iron (Crocus of Mars or colcothar) thus produced from salts of irron, and used as a polishing powder. Crocus of Venus (Old Chem.), oxide of copper.

The red oxide of copper; red copper; an important ore of copper, occurring massive and in isometric crystals.

e branching figures resembling shrubs or trees, produced by a foreign mineral, usually an oxide of manganese, as in the moss agate; also, a crystallized mineral having an arborescent form, e. g., gold or silver; an arborization.

The act or process of reducing from the state of an oxide.

To deprive of oxygen; to reduce from the state of an oxide.

originally composed of the juices of several plants (whence its name), but now made of an oxide of lead and oil, and consisting essentially of glycerin mixed with lead salts of the fat acids.

of rapidly becoming dry. Drying oil, an oil which, either naturally or after boiling with oxide of lead, absorbs oxygen from the air and dries up rapidly. Drying oils are used as the bases of many paints and varnishes.

Any earthy-looking metallic oxide, as alumina, glucina, zirconia, yttria, and thoria.

ar, massive, columnar, and in monoclinic crystals. It is a silicate of alumina, lime, and oxide of iron, or manganese.

the equivalents of hydrogen and oxygen in water are respectively 1 and 8, and in hydric dioxide 1 and 16.

tomic weight 165.9. Its salts are rose-colored and give characteristic spectra. Its sesquioxide is called erbia.

fats, resins, and pyroxylin, but finds its chief use as an anæsthetic. Called also ethyl oxide.ethyl ether.