apatite

apatite
1. Generic name for a class of minerals with compositions that are variants of the formula D5T3M, where D is a divalent cation, T is a trivalent tetrahedral compound ion, and M is a monovalent anion; calcium phosphate apatites are important mineral constituents of bones and teeth. See hydroxyapatite. 2. Ca5(PO4)3(OH,F,Cl).

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ap·a·tite 'ap-ə-.tīt n any of a group of calcium phosphate minerals occurring variously as hexagonal crystals, as granular masses, or in fine-grained masses as the chief constituent of bones and teeth and of phosphate rock esp calcium phosphate fluoride Ca5F(PO4)3

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ap·a·tite (apґə-tīt) [Gr. apatan to deceive] any of a group of minerals with the general formula 10Ca2+: 6PO43−: X− where X is a monovalent anion such as a chloride, carbonate, fluoride, or hydroxyl ion; when it contains a hydroxyl ion the compound is hydroxyapatite (q.v.), an important inorganic constituent of teeth and bones.

Medical dictionary. 2011.

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  • Apatite — Catégorie VIII : phosphates, arséniates, vanadates[1] Apatite Québec (Xl 32cm) …   Wikipédia en Français

  • 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

  • Apatite — Not to be confused with appetite. Apatite General Category Phosphate mineral group Chemical form …   Wikipedia

  • 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,… …   Universalium

  • 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 calculus — a urinary calculus composed of apatite …   Medical dictionary

  • 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

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