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See Fluorite.

The whites; leucorrhæa.

See Fluorite.

A white crystalline hydrocarbon C

Combined with fluorine; subjected to the action of fluoride. [R.]

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.

er 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.

stance, 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 fluorescent subst…

Having the property of fluorescence.

A colorless, amorphous substance which is produced by the reduction of fluoresceïn, and from which the latter may be formed by oxidation.

Pertaining to, obtained from, or containing, fluorine.

A binary compound of fluorine with another element or radical. Calcium fluoride (Min.), fluorite, CaF2. See Fluorite.

A non-metallic, gaseous element, strongly acid or negative, or associated with chlorine, bromine, and iodine, in the halogen group of which it is the first member. It always occurs combined, is very active chemically, and possesses such an avidity for most elements, and silicon especially, that it can neither be prepar…

Calcium fluoride, a mineral 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.…

A tetrahexahedron; -- so called because it is a common form of fluorite.

An instrument for observing or exhibiting fluorescence.

ect, as the human body, by exposing it to the X rays and observing the shadow cast upon a fluorescent screen; cryptoscopy.

Pertaining to fluor.

A double fluoride of boron and hydrogen, or some other positive element, or radical; -- called also fluoboride, and formerly fluoborate.

Pertaining to, or containing, hydrogen and fluorine; fluohydric; as, hydrofluoric acid. Hydrofluoric acid (Chem.), a colorless, mobile, volatile liquid, HF, very corrosive in its action, and having a strong, pungent, suffocating odor. It is produced by the action of sulphuric acid on fluorite, and is usually collected…