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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…

ng, and disinfecting agent. Symbol Cl. Atomic weight, 35.4. Chlorine family, the elements fluorine, chlorine, bromine, and iodine, called the halogens, and classed together from their common peculiariries.

A combining form indicating fluorine as an ingredient; as in fluosilicate, fluobenzene.

Pertaining to, derived from, or consisting of, fluorine and boron. Fluoridic acid (Chem.), a double fluoride, consisting essentially of a solution of boron fluoride, in hydrofluoric acid. It has strong acid properties, and is the type of the borofluorides. Called also borofluoric acid.

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

Pertaining to, obtained from, or containing, fluorine.

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

Composed of, or derived from, silicon and fluorine. Fluosilicic acid, a double fluoride of hydrogen and silicon, H2F6Si, obtained in solution in water as a sour fuming liquid, and regarded as the type of the fluosilicates; -- called also silicofluoric acid, and hydrofluosilicic acid.

a metal, forms a haloid salt; especially, chlorine, bromine, and iodine; sometimes, also, fluorine and cyanogen. See Chlorine family, under Chlorine.

ound in the ejected masses of Vesuvius. It is a silicate of iron and magnesia, containing fluorine.

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…

A mineral of a greenish yellow color; it is a silicate of glucina, lime, and soda with fluorine. Called also leucophanite.

color and a pearly luster. It is a silicate of aluminia, with magnesia, potash, and some fluorine. It is characteristic of crystalline limestone or dolomite and serpentine. See Mica.

Fluorine. [Written also phthor.]

Containing, or composed of, silicon and fluorine; especially, denoting the compounds called silicofluorides. Silicofluoric acid (Chem.), a compound of hydrofluoric acid and silicon fluoride, known only in watery solution. It is produced by the action of silicon fluoride on water, and is regarded as an acid, H2SiF6, and…

A manganese phosphate near triplite, but containing hydroxyl instead of fluorine.