Phosphorite

A phosphorite or phosphate rock is a non-detrital sedimentary rock which contains high amounts of phosphate bearing minerals. The phosphate content of phosphorite is at least 20% which is a large enrichment over the typical sedimentary rock content of less than 0.2%.Blatt, Harvey and Robert J. Tracy, "Petrology", Freeman, 1996, 2nd ed. pp. 345-349 ISBN 0-7167-2438-3 ] The phosphate is present as fluorapatite typically in cryptocrystalline masses (grain sizes < 1 μm) referred to as collophane. The dark brown to black beds range from a few centimetres to several metres in thickness. The layers contain the same textures and structures as fine grained limestones and may represent diagenetic replacements of carbonate minerals by phosphates.

Phosphorites are known from Proterozoic banded iron formations in Australia, but are more common from Paleozoic and Cenozoic sediments. The Permian Phosphoria Formation of the western United States represents some 15 million years of sedimentation reaches a thickness of 420 metres and covers an area of 350 000 km2. Commercially mined phosporites occur in France, Belgium, Spain, Morocco, Tunisia and Algeria. In the United States phosphorites have been mined in Florida, Tennessee, Wyoming and Idaho. [Klein, Cornelis and Cornelius S. Hurlbut, Jr., "Manual of Mineralogy", Wiley, 1985, 20th ed., p. 360, ISBN 0-471-80580-7 ]

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  • Phosphorite — Phosphorite, Staffel Lahngebiet, Allemagne, Muséum de Bonn La phosphorite est à la fois un minéral, une espèce chimique de formule 3 Ca3(PO4)2, Ca(OH,F,Cl)2, ainsi qu une roche phosphatée d origine détritique dont il est le principal constituant …   Wikipédia en Français

  • phosphorite — [ fɔsfɔrit ] n. f. • 1842; de phosphore ♦ Géol. Phosphate naturel de calcium (⇒ apatite). ● phosphorite nom féminin Phosphate naturel de calcium compact et à structure radiée, souvent très fossilifère. phosphorite [fɔsfɔʀit] n. f. ÉTYM. 1842 …   Encyclopédie Universelle

  • Phosphorite — Phos phor*ite, n. (Min.) A massive variety of apatite. [1913 Webster] …   The Collaborative International Dictionary of English

  • Phosphorite — Phosphorite, phosphatische Gesteine, die als Düngemittel bezw. zur Bereitung von Superphosphaten dienen (s. Phosphorsäuredünger). Die wichtigsten[108] derselben sind der echte Phosphorit oder Apatit (s.d.) und der Lahnphosphorit. Weitz …   Lexikon der gesamten Technik

  • phosphorite — [fäs′fə rīt΄] n. 1. natural calcium phosphate, similar chemically to apatite but without crystal form 2. a sedimentary PHOSPHATE ROCK phosphoritic [fäs′fərit′ik] adj …   English World dictionary

  • phosphorite — phosphoritic /fos feuh rit ik/, adj. /fos feuh ruyt /, n. a sedimentary rock sufficiently rich in phosphate minerals to be used as a source of phosphorus for fertilizers. [1790 1800; PHOSPHOR + ITE1] * * * or phosphate rock Rock with a high… …   Universalium

  • phosphorite — fosforitas statusas T sritis chemija apibrėžtis Mineralo apatito ir kitų fosfatų mišinys su karbonatais, smėliu arba moliu. atitikmenys: angl. phosphorite rus. фосфорит …   Chemijos terminų aiškinamasis žodynas

  • phosphorite — noun Date: 1796 1. a fibrous concretionary apatite 2. phosphate rock • phosphoritic adjective …   New Collegiate Dictionary

  • phosphorite — noun a sedimentary rock rich in phosphate minerals such as apatite …   Wiktionary

  • phosphorite — (fo sfo ri t ) s. f. Terme de minéralogie. Phosphate de chaux naturel …   Dictionnaire de la Langue Française d'Émile Littré


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