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he structure of a rock or a mineral; the structure of a sentence. It [basalt] has often a prismatic structure. Dana.

mbol S. Atomic weight 32. The specific gravity of ordinary octohedral sulphur is 2.05; of prismatic sulphur, 1.96.

be prepared by decomposition of the acid. It crystallizes in colorless, regular six-sided prisms, and is especially characterized by containing both nitrogen and sulphur, being chemically amido- isethionic acid, C

An instrument formed by combining prisms so as to correct the chromatic aberration of the light while linear dimensions of objects seen through the prisms are increased or diminished; -- called also prism telescope. Sir D. Brewster.

A mineral occurring in rhombic prisms, generally yellowish and pellucid, also colorless, and of greenesh, bluish, or brownish shades. It sometimes occurs massive and opaque. It is a fluosilicate of alumina, and is used as a gem.

A mineral occurring usually in three-sided or six-sided prisms terminated by rhombohedral or scalenohedral planes. Black tourmaline (schorl) is the most common variety, but there are also other varieties, as the blue (indicolite), red (rubellite), also green, brown, and white. The red and green varieties when transpare…

cast through, over, or across; as, to traject the sun's light through three or more cross prisms. [R.] Sir I. Newton.

is, that the object end of the telescope is placed at right angles to the eye end, with a prism of total reflection at the angle, and the eye end constitutes a portion of the horizontal axis of the instrument, having the eyepiece at the pivot and in the center of the altitude circle, so that the eye has convenient acce…

the earth or other substance. "Down to the veins of earth." Milton. Let the glass of the prisms be free from veins. Sir I. Newton.

A continuous tube formed from superposed large cylindrical or prismatic cells (tracheæ), which have lost their intervening partitions, and are usually marked with dots, pits, rings, or spirals by internal deposition of secondary membranes; a duct. Acoustic vessels. See under Acoustic. -- Weaker vessel, a woman; -- now…

on, or Refracted vision, vision by rays reflected from mirrors, or refracted by lenses or prisms, respectively. -- Vision purple. (Physiol.) See Visual purple, under Visual.

A dark brown or black mineral, occurring in prismatic crystals imbedded in limestone near Warwick, New York. It consists of the borate and titanate of magnesia and iron.

ght coming directly from the sun, without having been decomposed, as by passing through a prism. See the Note under Color, n., 1. (b) A kind of firework which gives a brilliant white illumination for signals, etc. -- White lime, a solution or preparation of lime for whitewashing; whitewash. -- White line (Print.), a…

o a flexible backing, as of cloth. Knight. -- Wood cell (Bot.), a slender cylindrical or prismatic cell usually tapering to a point at both ends. It is the principal constituent of woody fiber. -- Wood choir, the choir, or chorus, of birds in the woods. [Poetic] Coleridge. -- Wood coal, charcoal; also, lignite, or b…

A silicate of iron and lime occurring in black prismatic crystals; -- also called ilvaite. [Spelt also jenite.]

A grayish or whitish mineral occurring in orthorhombic, prismatic crystals, also in columnar masses. It is a silicate of alumina and lime, and is allied to epidote.