apatite

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ap·a·tite

(ăp′ə-tīt′)

1. Any of a group of natural, variously colored calcium phosphate minerals containing fluorine, chlorine, or hydroxyl. These compounds form hexagonal crystals and are components of bones and teeth, are a source of phosphorus for plants, and are used in the manufacture of fertilizers.

2. See fluorapatite.

[From Greek apatē, deceit (from its often being mistaken for other minerals).]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

apatite

(ˈæpəˌtaɪt)

(Minerals) a pale green to purple mineral, found in igneous rocks and metamorphosed limestones. It is used in the manufacture of phosphorus, phosphates, and fertilizers. Composition: calcium fluorophosphate or calcium chlorophosphate. General formula: Ca5(PO4,CO3)3(F,OH,Cl). Crystal structure: hexagonal

[C19: from German Apatit, from Greek apatē deceit; from its misleading similarity to other minerals]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ap•a•tite

(ˈæp əˌtaɪt)

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; < Greek apát(ē) trickery, fraud, deceit + -ite¹]

ap·a·tite

(ăp′ə-tīt′)

A usually green, transparent mineral consisting mainly of calcium phosphate. Apatite occurs as hexagonal crystals in igneous, metamorphic, and sedimentary rocks, and is used as a source of phosphate for making fertilizers. It is the mineral used to represent a hardness of 5 on the Mohs scale.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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Noun

apatite - a common complex mineral consisting of calcium fluoride phosphate or calcium chloride phosphate; a source of phosphorus

atomic number 15, P, phosphorus - a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms

atomic number 65, Tb, terbium - a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite

atomic number 69, thulium, Tm - a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime

mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition

fluorapatite - a form of apatite in which fluorine predominates over chlorine

Translations

апатит

References in periodicals archive ?

Pete Richards and John Rakovan for their help in the study of the oddly shaped apatites; David London, Vandall King and Skip Simmons for their discussions with me about the formation of the apatite stacks; John Rakovan, Frank Hawthorne and Marcus Origlieri for their chemical analyses of the apatite-(CaOH); Frank and Wendy Melanson for their help in reviewing the text and for their business partnership on the big lot of apatite specimens; and Jacques P.

Famous mineral localities: The Sapo mine Ferruginha district, Conselheiro Pena Minas Gerais, Brazil

Structure and chemistry of apatites and other calcium orthophosphates.

Thermal behaviour of bone apatite of Recent pike (Esox lucius L.)/Kaasaegse haugi (Esox lucius L.) luude apatiidi termilised omadused

This study examined the influence of three types of phosphate apatites and two microbial amendments on Pb availability.

Effects of phosphate and microbial amendments on lead (Pb) contaminated soil

Insoluble phosphates such as apatites are considered to be promising materials for immobilization of heavy metals in contaminated waters and soils in order to reduce their solubility and ecological bioavailability [1-6].

Natural and synthetic apatites as sorbents for [Cd.sup.2+] and [Cr.sup.3+] ions from aqueous solutions/Looduslikud ja sunteetilised apatiidid [Cd.sup.2+] ja [Cr.sup.3+] ioonide sidujatena vesilahustest

Thus, FRE increases with amount of carbonate substitution in apatite, with the most highly carbonate substituted apatites (i.e.

Beneficiation of apatite rock phosphates by calcination: effects on chemical properties and fertiliser effectiveness

Phosphate apatites form an enormous mineral group due to their huge isomorphic capacity [1, 2], which play an important role in many research areas such as biomaterials and environmental science [3-7].

Characterization, Dissolution, and Solubility of Zn-Substituted Hydroxylapatites [[([Zn.sub.x][Ca.sub.1-x]).sub.5][(P[O.sub.4]).sub.3]OH] at 25[degrees]C

Crystalchemical controls on rare-earth element concentrations in fossil biogenic apatites and implications for paleoenvironmental reconstructions.

Palaeoenvironmental signatures revealed from rare earth element (REE) compositions of vertebrate microremains of the Vesiku Bone Bed (Homerian, Wenlock), Saaremaa Island, Estonia

Papers from the symposium are collected here in 21 sections on topics including alumina/zirconia ceramics, apatites, bioglasses and glass-ceramics, biomimetics, bone substitutes, calcium phosphate ceramics, cell materials interactions, and dements.

Bioceramics; v.23; proceedings

Apatites are complex minerals, and when investigating their dissolution, several possible reactions must be considered [3].

Dissolution and Solubility Product of Cd-Fluorapatite [[Cd.sub.5][(P[O.sub.4]).sub.3]F] at pH of 2-9 and 25-45[degrees]C

Silicate apatites are well-known hosts for highly-efficient, stable phosphors because of the peculiarities of their diverse crystal structure and good physical and chemical stability [8-14].

Silicate apatite phosphors for pc-LED applications

It discusses biological hard tissues in vertebrates, synthetic apatites, hard tissue-related biomimetism, and apatite-like biomimetic nanoceramics.

Nanoceramics in Clinical Use: From Materials to Applications, 2nd Edition

Mesquita RA found higher numbers of Argyrophilic Nucleolar Organizer Regions (AgNORs) and proliferating cell nuclear antigen (PCNA)-positive cells in ossifying fibroma than in peripheral ossifying fibroma indicating higher proliferative activity in ossifying fibroma, X-ray diffraction analysis indicated that the mineral phase of both central and peripheral tissues consists of apatite crystals and that the crystallinity of these apatites is lower than that of bone apatite.

Peripheral cemento-ossifying fibroma

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