Calcium Carbonate (redirected from Oysco)

calcium carbonate, CaCO₃, 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(HCO₃)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

a white crystalline salt occurring in limestone, chalk, marble, calcite, coral, and pearl: used in the production of lime and cement. Formula: CaCO₃

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calcium carbonate [′kal·sē·əm ′kär·bə‚nāt]

(inorganic chemistry)

CaCO₃White rhombohedrons or a white powder; occurs naturally as calcite; used in paint manufacture, as a dentifrice, as an anticaking medium for table salt, and in manufacture of rubber tires.

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calcium carbonate

A low-density white pigment for use in paint; provides little opacity; used mainly to provide bulk and flatness.

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Calcium Carbonate 

CaCO₃, a salt.

Calcium carbonate occurs in nature in two mineral forms with differing crystalline structures: aragonite and the widely distributed calcite. Calcium carbonate decomposes when heated above 900°C: CaCO₃ = CaO + CO₂ (a means of obtaining lime). It is sparingly soluble in water (14 mg calcite per liter at 18°C) and readily soluble in acids. Natural calcium carbonate (limestone, marble) is used as a construction material; chalk (powdered calcium carbonate) serves as a filler for rubber stock, paper, and linoleum. A softer and finer product, called precipitated calcium carbonate (obtained through the reaction of CaCl₂ and Na₂CO₃), is used in the manufacture of tooth powderand cosmetics.