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These bauxites

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  • mineral deposit — Introduction       aggregate of a mineral in an unusually high concentration.       About half of the known chemical elements (chemical element) possess some metallic (metal) properties. The term metal, however, is reserved for those chemical… …   Universalium

  • Guinea — Infobox Country native name = République de Guinée conventional long name = Republic of Guinea common name = Guinea national motto = Travail, Justice, Solidarité spaces|2(French) Work, Justice, Solidarity national anthem = la Liberté… …   Wikipedia

  • Antoine Bonte — Portrait Antoine Bonte, né le 6 mars 1908 à Lille, décédé le 24 février 1995 à Gruson est un géologue français. Ingénieur de l Institut industriel du Nord (École centrale de Lille I.D.N 1932), en section Mécanique générale, Docteur ès sciences… …   Wikipédia en Français

  • cement — cementable, adj. cementer, n. cementless, adj. /si ment /, n. 1. any of various calcined mixtures of clay and limestone, usually mixed with water and sand, gravel, etc., to form concrete, that are used as a building material. 2. any of various… …   Universalium

  • duricrust — /door i krust , dyoor /, n. a hard crust that forms on or in soil in semiarid climates owing to cementation of soil particles. Cf. caliche, hardpan (defs. 1, 2). [ < L dur(us) hard + I + CRUST] * * * ▪ geology Introduction       surface or near… …   Universalium

  • aluminum processing — Introduction       preparation of the ore for use in various products.       Aluminum, or aluminium (Al), is a silvery white metal with a melting point of 660° C (1,220° F) and a density of 2.7 grams per cubic centimetre. The most abundant… …   Universalium

  • Microspherulite — Microspherulites are microscopic spherical particles with < 2 mm diameters, usually in the 100 micrometre range, mainly consisting of mineral material (the Greek litos means stone ). Only bodies created by natural physico chemical… …   Wikipedia

  • Alanya —   District   Alanya city center a …   Wikipedia

  • AUTRICHE — Pays de 83 855 km2, l’Autriche, quoique deux fois plus vaste que la Suisse, est à peine plus peuplée (7,7 millions d’habitants en 1990); elle est aussi plus alpestre: les Alpes et les Préalpes couvrent près de 70 p. 100 du pays alors qu’elles… …   Encyclopédie Universelle

  • Red beds — The term red beds usually refers to strata of reddish colored sedimentary rocks such as sandstone, siltstone or shale that were deposited in hot climates under oxidizing conditions. [http://www.ac.wwu.edu/ babcock/v2 1.html] The red color comes… …   Wikipedia

  • Aluminium oxide — Alumina redirects here. For the company, see Alumina Limited. This article is about aluminium(III) oxide Al2O3. For other uses, see Aluminium oxide (disambiguation). Aluminium oxide …   Wikipedia

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