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Bismuth trioxide, or bismuth ocher.

g to bismuth; containing bismuth, when this element has its higher valence; as, bismuthic oxide.

swampy land; a variety of brown iron ore, or limonite. (b) Bog manganese, the hydrated peroxide of manganese. -- Bog rush (Bot.), any rush growing in bogs; saw grass. -- Bog spavin. See under Spavin.

of several varieties of friable earthy clay, usually colored more or less strongly red by oxide of iron, and used to color and adulterate various substances. It was formerly used in medicine. It is composed essentially of hydrous silicates of alumina, or more rarely of magnesia. See Clay, and Terra alba.…

process for producing upon articles of iron or steel an adherent coating of the magnetic oxide of iron (which is not liable to corrosion by air, moisture, or ordinary acids). This is accomplished by producing, by oxidation at about 1600º F. in a closed space, a coating containing more or less of the ferric oxide (Fe2O…

A native oxide of manganese, of dark brownish black color. It was named from a Mr. Braun of Gotha.

A mineral consisting of titanic oxide, and hence identical with rutile and octahedrite in composition, but crystallizing in the orthorhombic system.

al, wood coal. See Lignite. -- Brown hematite or Brown iron ore (Min.), the hydrous iron oxide, limonite, which has a brown streak. See Limonite. -- Brown holland. See under Holland. -- Brown paper, dark colored paper, esp. coarse wrapping paper, made of unbleached materials. -- Brown spar (Min.), a ferruginous var…

An oxide of zinc which collects on the sides of furnaces where zinc is sublimed. Formerly applied to the mineral calamine.

The act or process of reducing a metal to an oxide or metallic calx; oxidation.

assive, generally of a yellow color, containing silica, alumina, lime, soda, and carbon dioxide.

soft, and occurs in hexagonal prisms or tables. When united with oxygen it forms carbon dioxide, commonly called carbonic acid, or carbonic oxide, according to the proportions of the oxygen; when united with hydrogen, it forms various compounds called hydrocarbons. Compare Diamond, and Graphite. Carbon compounds, Compo…

Of, pertaining to, or obtained from, carbon; as, carbonic oxide. Carbonic acid (Chem.), an acid H2CO3, not existing separately, which, combined with positive or basic atoms or radicals, forms carbonates. On common language the term is very generally applied to a compound of carbon and oxygen, CO2, more correctly called…

and measuring the amount of carbon which is present, or more esp. the amount of carbon dioxide, by its action on limewater or by other means.

Native tin dioxide; tin stone; a mineral occurring in tetragonal crystals of reddish brown color, and brilliant adamantine luster; also massive, sometimes in compact forms with concentric fibrous structure resembling wood (wood tin), also in rolled fragments or pebbly (Stream tin). It is the chief source of metallic ti…

-- Caustic lime. See under Lime. -- Caustic potash, Caustic soda (Chem.), the solid hydroxides potash, KOH, and soda, NaOH, or solutions of the same. -- Caustic silver, nitrate of silver, lunar caustic. -- Caustic surface (Optics), a surface to which rays reflected or refracted by another surface are tangents. Caus…

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

s regarded as a double sulphate of chromium and potassium. -- Chrome green (a) The green oxide of chromium, Cr2O3, used in enamel painting, and glass staining. (b) A pigment made by mixing chrome yellow with Prussian blue. -- Chrome red, a beautiful red pigment originally prepared from the basic chromate of lead, but…

A black submetallic mineral consisting of oxide of chromium and iron; -- called also chromic iron.

ks.] (Med.) Same as Dragon's blood. -- Green cinnabar, a green pigment consisting of the oxides of cobalt and zinc subjected to the action of fire. -- Hepatic cinnabar (Min.), an impure cinnabar of a liver-brown color and submetallic luster.