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A yellow crystalline substance extracted from fustet, and regarded as its essential coloring principle; -- called also fisetic acid.

ided in the direction of the grain, like wood, or along natural planes of cleavage, like crystals. This crystal is a pellucid, fissile stone. Sir I. Newton.

A compound or twin crystal consisting of five individuals.

A yellow, crystalline, organic dyestuff, C16H14N2, of artifical production. It is a strong base, and is a complex derivative of aniline and quinoline.

A yellow, crystalline, organic base, C13H12N2O, obtained artificially.

A yellow, crystalline substance, obtained from anthraquinone, and regarded as a hydroxyl derivative of it.

so called, because formerly the silica was obtained from pulverized flints. Called also crystal glass. Cf. Glass.

tructure characteristic of certain volcanic rocks in which the arrangement of the minute crystals shows the lines of flow of thew molten material before solidification; -- also called fluxion structure.

A white crystalline hydrocarbon C

A colorless, crystalline hydrocarbon, C13H10 having a beautiful violet fluorescence; whence its name. It occurs in the higher boiling products of coal tar, and is obtained artificially.

A yellowish red, crystalline substance, C20H12O5, produced by heating together phthalic anhydride and resorcin; -- so called, from the very brilliant yellowish green fluorescence of its alkaline solutions. It has acid properties, and its salts of the alkalies are known to the trade under the name of uranin.…

n their substance, light different in color from the mass of the material, as when green crystals of fluor spar afford blue reflections. It is due not to the difference in the color of a distinct surface layer, but to the power which the substance has of modifying the light incident upon it. The light emitted by fluore…

of many different colors, white, yellow, purple, green, red, etc., often very beautiful, crystallizing commonly in cubes with perfect octahedral cleavage; also massive. It is used as a flux. Some varieties are used for ornamental vessels. Also called fluor spar, or simply fluor.

(Mach.), a nut with wings; a thumb nut; a finger nut. -- Fly orchis (Bot.), a plant (Ophrys muscifera), whose flowers resemble flies. -- Fly paper, poisoned or sticky paper for killing flies that feed upon or are entangled by it. -- Fly powder, an arsenical powder used to poison flies. -- Fly press, a screw press…

Laminated, but restricted to the variety of laminated structure found in crystalline schist, as mica schist, etc.; schistose.

The property, possessed by some crystalline rocks, of dividing into plates or slabs, which is due to the cleavage structure of one of the constituents, as mica or hornblende. It may sometimes include slaty structure or cleavage, though the latter is usually independent of any mineral constituent, and transverse to the…

A kind of soft sweetmeat made by boiling solutions to the point of crystallization, usually molded; as, cherry fondant.

The combination of planes included under a general crystallographic symbol. It is not necessarily a closed solid.

A compound or twin crystal consisting of four individuals.

To separate by means of, or to subject to, fractional distillation or crystallization; to fractionate; -- frequently used with out; as, to fraction out a certain grade of oil from pretroleum.