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magnesia
magnesia common name for the chemical compound magnesium oxide, MgO. It occurs as colorless, cubic crystals. It is refractory, melting at about 2,800°C. It is very slightly soluble in pure water but is soluble in acids and solutions of ammonium salts. The magnesia of commerce is a fine white powder used in soaps, cosmetics, pharmaceuticals, and as a filler in rubber goods. Magnesia is used to make crucibles and other ceramic goods. Crude magnesia is prepared by roasting dolomite (calcium magnesium double carbonate) or magnesite (magnesium carbonate). Pure magnesia is prepared by refining the crude product. Magnesia is also extracted from seawater. It occurs in nature as the mineral periclase. |
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"magnesia." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 29 May. 2012 <http://www.encyclopedia.com>. "magnesia." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (May 29, 2012). http://www.encyclopedia.com/doc/1E1-magnesia.html "magnesia." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved May 29, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-magnesia.html |
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magnesia
magnesia
A. †(alch.) mineral ingredient of the philosopher's stone XIV; B. †(spec. black m.) manganese XVII; C. (spec. †white m.) hydrated magnesium carbonate, used medicinally; (chem.) magnesium oxide XVIII. — medL. magnēsia — Gr. (hē) Magnēsía (líthos) ‘the Magnesian stone’, (1) loadstone, (2) stone with silvery sheen; the development of senses B and C is obscure. Hence magnesium XIX. |
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T. F. HOAD. "magnesia." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 29 May. 2012 <http://www.encyclopedia.com>. T. F. HOAD. "magnesia." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (May 29, 2012). http://www.encyclopedia.com/doc/1O27-magnesia.html T. F. HOAD. "magnesia." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved May 29, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-magnesia.html |
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magnesia
magnesia Magnesium oxide (MgO), a white, neutral, stable powder formed when magnesium is burned in oxygen. It is used industrially in firebrick and medicinally in stomach powders. Magnesium carbonate, found as magnesite and also used as an antacid, is often called magnesia.
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"magnesia." World Encyclopedia. 2005. Encyclopedia.com. 29 May. 2012 <http://www.encyclopedia.com>. "magnesia." World Encyclopedia. 2005. Encyclopedia.com. (May 29, 2012). http://www.encyclopedia.com/doc/1O142-magnesia.html "magnesia." World Encyclopedia. 2005. Retrieved May 29, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-magnesia.html |
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magnesia
mag·ne·sia / magˈnēzhə; -ˈnēshə/ • n. Chem. magnesium oxide, MgO. ∎ hydrated magnesium carbonate used as an antacid and laxative. |
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Cite this article
"magnesia." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 29 May. 2012 <http://www.encyclopedia.com>. "magnesia." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (May 29, 2012). http://www.encyclopedia.com/doc/1O999-magnesia.html "magnesia." The Oxford Pocket Dictionary of Current English. 2009. Retrieved May 29, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-magnesia.html |
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