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calcium carbonate
calcium carbonate CaCO 3 , white chemical compound that is the most common nonsiliceous mineral. It occurs in two crystal forms: calcite, which is hexagonal, and aragonite, which is rhombohedral. Calcium carbonate is largely insoluble in water but is quite soluble in water containing dissolved carbon dioxide, combining with it to form the bicarbonate Ca(HCO 3 ) 2 . Such reactions on limestone (which is mainly composed of calcite) account for the formation of stalactites and stalagmites in caves. Iceland spar is a pure form of calcium carbonate and exhibits birefringence, or double refraction . |
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"calcium carbonate." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "calcium carbonate." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1E1-calciumcar.html "calcium carbonate." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-calciumcar.html |
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calcium carbonate
calcium carbonate (CaCO3) White compound, insoluble in water, that occurs naturally as marble, chalk, limestone and calcite. Crystals are in the hexagonal system and vary in form. Calcium carbonate is used in the manufacture of cement, iron, steel and lime, to neutralize soil acidity and as a constituent of antacids. Properties: r.d. 2.7 (calcite).
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"calcium carbonate." World Encyclopedia. 2005. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "calcium carbonate." World Encyclopedia. 2005. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O142-calciumcarbonate.html "calcium carbonate." World Encyclopedia. 2005. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-calciumcarbonate.html |
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calcium carbonate
calcium carbonate (kar-bŏ-nayt) n. a salt of calcium that neutralizes acids and is used in many antacid preparations. It is also used as a calcium supplement and to reduce high blood levels of phosphates (which it binds) in patients with renal failure. Formula: CaCO3.
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"calcium carbonate." A Dictionary of Nursing. 2008. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "calcium carbonate." A Dictionary of Nursing. 2008. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O62-calciumcarbonate.html "calcium carbonate." A Dictionary of Nursing. 2008. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O62-calciumcarbonate.html |
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calcium carbonate
cal·ci·um car·bon·ate • n. a white, insoluble solid, CaCO3, occurring naturally as chalk, limestone, marble, and calcite, and forming mollusk shells and stony corals. |
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"calcium carbonate." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "calcium carbonate." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O999-calciumcarbonate.html "calcium carbonate." The Oxford Pocket Dictionary of Current English. 2009. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-calciumcarbonate.html |
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