calcium carbonate

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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

World Encyclopedia | 2005 | Â© World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

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

A Dictionary of Nursing | 2008 | Â© A Dictionary of Nursing 2008, originally published by Oxford University Press 2008. (Hide copyright information) Copyright

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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