apatite

/ap"euh tuyt'/, n.
a common mineral, calcium fluorophosphate, Ca5FP3O12, occurring in individual crystals and in masses and varying in color, formerly used in the manufacture of phosphate fertilizers.
[1795-1805; < Gk apát(e) trickery, fraud, deceit + -ITE1]

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A member of the phosphate group of minerals, the world's major source of phosphorus, found as variously coloured, glassy crystals, masses, or nodules.

Much of it has a chemical composition approximating Ca5(PO4)3(F,Cl,OH). If not for its softness, apatite would be a popular gemstone; some of the material found is clear, but it is fragile and difficult to cut and polish.

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      any member of a series of phosphate minerals, the world's major source of phosphorus, found as variously coloured, glassy crystals, masses, or nodules. If not for its softness (Mohs hardness 5, compared with the 7 to 9 of most gems), apatite would be a popular gemstone; much of the material found is clear, but it is fragile and difficult to cut and polish. asparagus stone is a clear, asparagus-green gem variety of apatite; moroxite, a clear blue.

      The series includes fluorapatite (the most important mineral commercially), chlorapatite, hydroxylapatite, and carbonate-apatite. These minerals are all calcium phosphates, differing from one another chemically only in that fluorapatite contains fluorine; chlorapatite, chlorine; hydroxylapatite, a hydroxyl (OH) group; and carbonate-apatite, a carbonate (CO3) group. The fluorine, chlorine, hydroxyl, and carbonate substitute for one another, so that in nature most apatite is a mixture of several of the compounds. Chlorapatite and carbonate-apatite are comparatively rare. For properties, see phosphate mineral (table).

      Apatite is a member of a group of structurally related minerals having compositions symbolized A5 (BO4)3X, in which A is a metal, commonly calcium or lead; B is phosphorus, vanadium, or arsenic; and X is chlorine, fluorine, or hydroxyl. The group contains three series: the apatite series, the pyromorphite series, and the svabite series (intermediate between the other two).

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Universalium. 2010.

Look at other dictionaries:

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  • apatite — [ apatit ] n. f. • 1802; d ab. en all.; du gr. apatân « tromper », c. à d. « pierre trompeuse, pseudo précieuse » ♦ Minér. Phosphate de calcium en cristaux ou agrégats, à inclusions fréquentes de chlore (chlorapatiten. f.), de fluor, de silicium… …   Encyclopédie Universelle

  • Apatite — Ap a*tite, n. [Gr. ? deceit, fr. ? to deceive; it having been often mistaken for other minerals.] (Min.) Native phosphate of lime, occurring usually in six sided prisms, color often pale green, transparent or translucent. [1913 Webster] …   The Collaborative International Dictionary of English

  • apatite — s. f. [Mineralogia] Fosfato de cálcio natural.   ♦ Grafia no Brasil: apatita …   Dicionário da Língua Portuguesa

  • apatite — [ap′ə tīt΄] n. [Ger apatit < Gr apatē, deceit + ITE1: so named from being mistaken for other minerals] any of a group of variously colored, hard, hexagonal calcium minerals, Ca5 (PO4, CO3) 3 (F,OH,Cl), found mainly in sedimentary rocks, esp.… …   English World dictionary

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  • apatite — noun /ˈæp.ə.taɪt/ A calcium fluoride phosphate of variable composition, sometimes used in the manufacture of fertilizer. We had prepared, by precipitation methods, finely divided crystalline apatites that were similar in crystal size and x ray… …   Wiktionary

  • apatite — apatitas statusas T sritis chemija apibrėžtis Mineralas. formulė Ca₅[(F,OH)|(PO₄)₃] atitikmenys: angl. apatite rus. апатит …   Chemijos terminų aiškinamasis žodynas

  • apatite — noun Etymology: German Apatit, from Greek apatē deceit Date: 1803 any of a group of calcium phosphate minerals occurring in various colors as hexagonal crystals, as granular masses, or in fine grained masses as the chief constituent of phosphate… …   New Collegiate Dictionary

  • apatite II — a proprietary preparation of fish bones used in removing heavy metals from soil and water. The metals are chemically bound into new minerals that do not dissolve or leach over extremely long time periods …   Dictionary of ichthyology

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