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An earthy black oxide of copper, arising from the decomposition of other ores.

An elementary substance, as sodium, calcium, or copper, whose oxide or hydroxide has basic rather than acid properties, as contrasted with the nonmetals, or metalloids. No sharp line can be drawn between the metals and nonmetals, and certain elements partake of both acid and basic qualities, as chromium, manganese, bis…

A manner of engraving on copper or steel by drawing upon a surface previously roughened, and then removing the roughness in places by scraping, burnishing, etc., so as to produce the requisite light and shade. Also, an engraving so produced.

design in relief, used for imprinting a reversed copy of the design in a softer metal, as copper.

An alloy consisting of copper, nickel, tungsten, and aluminium; -- used by jewelers.

al. -- Mineral cotton. See Mineral wool (below). -- Mineral green, a green carbonate of copper; malachite. -- Mineral kingdom (Nat. Sci.), that one of the three grand divisions of nature which embraces all inorganic objects, as distinguished from plants or animals. -- Mineral oil. See Naphtha, and Petroleum. -- Mi…

An impure yellow sulphate of iron; yellow copperas or copiapite.

A piece of metal, as gold, silver, copper, etc., coined, or stamped, and issued by the sovereign authority as a medium of exchange in financial transactions between citizens and with government; also, any number of such pieces; coin. To prevent such abuses, ... it has been found necessary ... to affix a public stamp up…

Any substance, as alum or copperas, which, having a twofold attraction for organic fibers and coloring matter, serves as a bond of union, and thus gives fixity to, or bites in, the dyes.

s. -- Mountain beaver (Zoöl.), the sewellel. -- Mountain blue (Min.), blue carbonate of copper; azurite. -- Mountain cat (Zoöl.), the catamount. See Catamount. -- Mountain chain, a series of contiguous mountain ranges, generally in parallel or consecutive lines or curves. -- Mountain cock (Zoöl.), capercailzie. Se…

f by a shuttle. -- Needle ore (Min.), acicular bismuth; a sulphide of bismuth, lead, and copper occuring in acicular crystals; -- called also aikinite. -- Needle shell (Zoöl.), a sea urchin. -- Needle spar (Min.), aragonite. -- Needle telegraph, a telegraph in which the signals are given by the deflections of a mag…

An alloy resembling silver, and consisting chiefly of copper, zinc, and nickel, with small proportions of tin, aluminium, and bismuth. Ure.

A mineral of a copper-red color and metallic luster; an arsenide of nickel; -- called also coppernickel, kupfernickel.

aining nickel; esp., a five-cent piece. [Colloq. U.S.] Nickel silver, an alloy of nickel, copper, and zinc; -- usually called german silver; called also argentan.

cid. -- Nitric oxide, a colorless poisous gas (NO) obtained by treating nitric acid with copper. On contact with the air or with oxygen, it becomes reddish brown from the formation of nitric dioxide or peroxide.

Colored rings formed upon a metal plate by the electrolytic disposition of copper, lead peroxide, etc. They may be produced by touching with a pointed zinc rod a silver plate on which is a solution of copper sulphate.

A rare metallic element, of doubtful identification, said to occur in the copper-nickel of Norway.

A copper coin, used in the Ionian Islands, about one cent in value.

Copper wire with a strong but light insulation, used in wiring houses, etc.

An olive-green mineral, a hydrous arseniate of copper; olive ore.