fluorite

fluor·ite

F0207100 (flo͝or′īt′, flôr′-)n. A mineral, essentially CaF₂, that is often fluorescent in ultraviolet light and occurs in light green, blue, yellow, brown, and colorless forms. Also called fluor, fluorspar.

fluorite

(ˈflʊəraɪt) n (Minerals) US and Canadian a white or colourless mineral sometimes fluorescent and often tinted by impurities, found in veins and as deposits from hot gases. It is used in the manufacture of glass, enamel, and jewellery, and is the chief ore of fluorine. Composition: calcium fluoride. Formula: CaF2. Crystal structure: cubic. Also called (in Britain and certain other countries): fluorspar or fluor

fluo•rite

(ˈflʊər aɪt, ˈflɔr-, ˈfloʊr-)

n. a mineral, calcium fluoride, CaF₂, occurring in crystals and in masses: the chief source of fluorine. Also called fluor , fluorspar. [1865–70; < Italian; see fluor, -ite¹]

fluor·ite

(flo͝or′īt′) A mineral consisting of calcium fluoride. Fluorite occurs in many colors (especially yellow and purple), usually in crystals shaped like cubes or octahedrons, and is often fluorescent in ultraviolet light. It is the mineral used to represent a hardness of 4 on the Mohs scale.

Thesaurus

Noun

fluorite - a soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorinefluor, fluorsparatomic number 20, Ca, calcium - a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animalsatomic number 9, fluorine, F - a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatitemineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition

fluorite

(flo͞o`ərīt) or

fluorspar

(flo͞o`ərspär), mineral appearing in various colors, e.g., green, yellow-brown, rose, and red. Chemically, it is calcium fluoride, CaF₂. Its crystals, commonly cubic, are transparent or translucent and under certain conditions exhibit fluorescence. The mineral also occurs in granular and massive forms. Fluorite is found in various parts of the world, especially in England, Germany, Mexico, and in Kentucky and Illinois in the United States. Its chief use is as a flux in metallurgy, but it is also employed in the preparation of hydrofluoric acid and in the manufacture of opal glass and enamel; some of its colorless crystals are used for making lenses and prisms.

Fluorite

(also fluorspar), a mineral of the fluoride group, with the chemical composition CaF₂. Small amounts of Ca are sometimes replaced by Y (yielding yttrofluorite), rare-earth elements, Sr, Mn, Na, or U. Fluorite crystallizes in the isometric system, forming the fluorite structure (seeCRYSTAL STRUCTURE). Most fluorite crystals are cubes or octahedrons. The massive varieties may be composite, coarsely crystalline, granular, or earthy; one of the earthy varieties is ratovkite.

Fluorite has a hardness of 4 on Mohs’ scale, a density of 3,180–3,200 kg/m³, and a melting point of 1360°C. The density of yttrofluorite can be as high as 3,300 kg/m³. The mineral comes in various colors, for example, yellow, green, or violet. The coloration is often banded or patchy owing to the formation of color centers. Fluorite is characterized by luminescence upon exposure to ultraviolet radiation. The luminescence is caused by impurity centers: Eu²⁺ ions in the blue-violet region of the spectrum and Yb²⁺ ions in the yellow-green region. Thermoluminescence due to Mn²⁺ ions and triply ionized atoms of rare-earth elements is observed. Fluorite is isotropic, has a low dispersion and a low refractive index (1.434), and is transparent in the wavelength range 0.0125–10 micrometers. The transparency to such radiation makes fluorite a valuable optical raw material.

Fluorite is a common mineral and occurs in many different kinds of deposits. It is deposited overa broad temperature range, is primarily hydrothermal and metasomatic, and is sometimes found as ratovkite in sedimentary rocks. It is an important typomorphic mineral in genetic mineralogy.

Fluorite is used in metallurgy as a flux, in the chemical industry to produce hydrofluoric acid and cryolite, and in ceramics to manufacture enamels and glazes. It is also employed as the stock material for growing synthetic fluorite crystals. Pure transparent colorless or slightly tinted varieties of fluorite are used in optics to manufacture lenses, objectives, telescopes, and prisms for vacuum and X-ray spectrographs. Synthetic fluorite doped with rare-earth elements or uranium is a laser material.

The fluorite deposits in the USSR include those at Voznesenskoe in the Primor’e Krai, Solonechnoe in Middle Asia, Abagaituiskoe in Transbaikalia, and Taskainar in Kazakhstan. Outside the USSR, fluorite deposits are found in the USA, Mexico, France, and other countries. The deposits in the USA include those at Cave in Rock, 111., and in the Rocky Mountains.

REFERENCES

Rostov, I. Mineralogiia. Moscow, 1971. (Translated from English.)
Mineraly: Spravochnik, vol. 2, issue 1. Moscow, 1963.

N. N. VASIL’KOVA

fluorite

[′flu̇r‚īt] (mineralogy) CaF₂ A transparent to translucent, often blue or purple mineral, commonly found in crystalline cubes in veins and associated with lead, tin, and zinc ores; hardness is 4 on Mohs scale; the principal ore of fluorine. Also known as Derbyshire spar; fluor; fluorspar.

fluorspar

, fluor (US and Canadian), fluorite a white or colourless mineral sometimes fluorescent and often tinted by impurities, found in veins and as deposits from hot gases. It is used in the manufacture of glass, enamel, and jewellery, and is the chief ore of fluorine. Composition: calcium fluoride. Formula: CaF₂. Crystal structure: cubic

fluorite

fluor·ite

fluorite

fluo•rite

fluor·ite

fluorite

fluorite

fluorspar

Fluorite

REFERENCES

fluorite

fluorspar

fluorite

Synonyms for fluorite

noun a soft mineral (calcium fluoride) that is fluorescent in ultraviolet light

Synonyms

Related Words