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an oxide of tin, or of tin and lead in various proportions, much used in polishing glass, metal, precious stones, etc.

occurring in rhombohedral crystals or massive, and is of a dark red or black color with a metallic adamantine luster.

A common mineral of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system; iron pyrites; iron disulphide. Hence sable coal his massy couch extends, And stars of gold the sparkling pyrite blends. E. Darwin.

A name given to a number of metallic minerals, sulphides of iron, copper, cobalt, nickel, and tin, of a white or yellowish color.

A crude acetate produced by treating pyroligneous acid with a metal or basic compound; as, pyrolignite of iron (iron liquor).

Manganese dioxide, a mineral of an iron-black or dark steel- gray color and metallic luster, usually soft. Pyrolusite parts with its oxygen at a red heat, and is extensively used in discharging the brown and green tints of glass (whence its name).

A bronze-colored mineral, of metallic luster. It is a sulphide of iron, and is remarkable for being attracted by the magnet. Called also magnetic pyrites.

place of deposit for certain sample coins taken for a trial of the weight and fineness of metal before it is sent from the mint. Mushet.

A block of type metal lower than the letters, -- used in spacing and in blank lines. [Abbrev. quad.]

d with enough silver to reduce the fineness so as to allow acids to attack and remove all metals except the gold; -- called also inquartation. Compare Parting.

) of the Spurge family, having an herbaceous stem and a perennial woody root. -- Queen's metal (Metal.), an alloy somewhat resembling pewter or britannia, and consisting essentially of tin with a slight admixture of antimony, bismuth, and lead or copper. -- Queen's pigeon. (Zoöl.) Same as Queen pigeon, above. -- Que…

The metal mercury; -- so called from its resemblance to liquid silver. Quicksilver horizon, a mercurial artificial horizon. See under Horizon. -- Quicksilver water, a solution of mercury nitrate used in artificial silvering; quick water.

A wedgelike piece of stone, wood metal, or other material, used for various purposes, as: (a) (Masonry)

A piece of hollow type metal, lower than type, and measuring two or more pica ems in length and breadth, used in the blank spaces at the beginning and end of chapters, etc. Quotation marks (Print.), two inverted commas placed at the beginning, and two apostrophes at the end, of a passage quoted from an author in his ow…

A scraping tool for smoothing metal.

To wash on a rack, as metals or ore.

undamental constituent of any compound; hence, sometimes, an atom. As a general rule, the metallic atoms are basic radicals, while the nonmetallic atoms are acid radicals. J. P. Cooke.

An intensely radioactive metallic element found (combined) in minute quantities in pitchblende, and various other uranium minerals. Symbol, Ra; atomic weight, 226.4. Radium was discovered by M. and Mme. Curie, of Paris, who in 1902 separated compounds of it by a tedious process from pitchblende. Its compounds color fla…

A bar of timber or metal, usually horizontal or nearly so, extending from one post or support to another, as in fences, balustrades, staircases, etc.

Lifted up; showing above the surroundings; as, raised or embossed metal work.