magnesite

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magnesite

magnesite , mineral, magnesium carbonate, MgCO ₃ , white, yellow, or gray in color. It originates through the alteration of olivine or of serpentine by waters carrying carbon dioxide; through the replacement of calcium by magnesium in calcareous rocks, sometimes limestone but more often dolomite; and through precipitation from waters rich in magnesium that have undergone reaction with sodium carbonate. Caustic magnesite is not thoroughly calcined, 3% to 4% of carbon dioxide being left; mixed with magnesium chloride it makes oxychloride cement, which is extensively used for floorings and as a stucco. Dead-burned magnesite is calcined in kilns until it contains less than 1% of carbon dioxide; it is made into an excellent firebrick . Magnesite is also used in the manufacture of Epsom salts, face powder, boiler wrappings, and disinfectants.

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magnesite

A Dictionary of Earth Sciences | 1999 | | Â© A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

magnesite Carbonate, MgCO₃ and end-member of a solid solution series with siderite, FeCo₃; sp. gr. 3.0; hardness 4; whitish; earthy lustre; compact or granular; occurs as an alteration product of serpentines, dolomites, or limestones and may form as a chemical precipitate. It is mined commercially and used in the production of magnesium compounds, refractory products, and special cements.

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AILSA ALLABY and MICHAEL ALLABY. "magnesite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 23 Nov. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "magnesite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (November 23, 2009). http://www.encyclopedia.com/doc/1O13-magnesite.html

AILSA ALLABY and MICHAEL ALLABY. "magnesite." A Dictionary of Earth Sciences. 1999. Retrieved November 23, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-magnesite.html

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Free newspaper and magazine articles

	Trends and Prospects in International Trade of Natural Magnesium Carbonate (Magnesite) Revealed. Business Wire; 10/23/2008
	Global Magnesium, Magnesite, and Dolomite Markets Forecasted to 2010. Business Wire; 6/13/2006
	Research and Markets: World Refractory Magnesia Market Moving Back Towards Balance. Business Wire; 6/14/2005

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	Magnesite and magnesia Magazine article from: Mining Engineering; 6/1/1997; ; 700+ words ; Magnesite and magnesia are among the most complex...number of grades and the number of uses. Magnesite is an important industrial mineral in...sources complicate any discussion of magnesite because the end products are indistinguishable...
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