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bauxite
bauxite A mixture of three hydrates of alumina, mainly gibbsite, and also diaspore and boehmite, and containing impurities of iron, phosphorus, and titanium; colour is variable from dirty white through grey, yellow, brown, and red; sp. gr. 2.0–2.55; hardness 1–3; it can be compact, earthy, concretionary (see CONCRETION), pisolitic, or oolitic. Bauxite results from the tropical weathering of aluminium silicate rocks under good surface drainage to yield clay minerals which are subsequently desilicated. Minerals associated with the alumina hydrates in bauxites and laterites (ferruginous bauxites) include goethite and lepidocrocite, hematite, and the clay minerals kaolinite and halloysite. Bauxite is the main ore of aluminium and to be commercially exploited should contain more than 25–30% aluminium oxide. The main constraint is the amount of available alumina which can be extracted by the Bayer or similar process. It is named after Les Baux de Provence, in southern France; the major producers are Australia and Brazil.
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AILSA ALLABY and MICHAEL ALLABY. "bauxite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. AILSA ALLABY and MICHAEL ALLABY. "bauxite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O13-bauxite.html AILSA ALLABY and MICHAEL ALLABY. "bauxite." A Dictionary of Earth Sciences. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-bauxite.html |
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bauxite
baux·ite / ˈbôksīt/ • n. an amorphous clayey rock that is the chief commercial ore of aluminum. It consists largely of hydrated alumina with variable proportions of iron oxides. DERIVATIVES: baux·it·ic / ˌbôkˈsitik/ adj. |
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"bauxite." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. "bauxite." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O999-bauxite.html "bauxite." The Oxford Pocket Dictionary of Current English. 2009. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-bauxite.html |
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bauxite
bauxite Rock from which most aluminium is extracted. Bauxite is a mixture of several minerals, such as diaspore, gibbsite, boehmite and iron. It is formed by prolonged weathering and leaching of rocks containing aluminium silicates.
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"bauxite." World Encyclopedia. 2005. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. "bauxite." World Encyclopedia. 2005. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O142-bauxite.html "bauxite." World Encyclopedia. 2005. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-bauxite.html |
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bauxite
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T. F. HOAD. "bauxite." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. T. F. HOAD. "bauxite." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O27-bauxite.html T. F. HOAD. "bauxite." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-bauxite.html |
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bauxite
bauxite
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"bauxite." Oxford Dictionary of Rhymes. 2007. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. "bauxite." Oxford Dictionary of Rhymes. 2007. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O233-bauxite.html "bauxite." Oxford Dictionary of Rhymes. 2007. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O233-bauxite.html |
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