calcium carbonate

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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 limestonelimestone,
sedimentary rock wholly or in large part composed of calcium carbonate. It is ordinarily white but may be colored by impurities, iron oxide making it brown, yellow, or red and carbon making it blue, black, or gray. The texture varies from coarse to fine.
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 (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 refractionrefraction,
in physics, deflection of a wave on passing obliquely from one transparent medium into a second medium in which its speed is different, as the passage of a light ray from air into glass.
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

calcium carbonate

[′kal·sē·əm ′kär·bə‚nāt]
(inorganic chemistry)
CaCO3 White 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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

calcium carbonate

A low-density white pigment for use in paint; provides little opacity; used mainly to provide bulk and flatness.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Micrometer sized CaCO3 and Al2O3 powders (or the nanometer sized CaCO3 and Al2O3 powders) mixed with a molar ratio of 12: 7 (namely, n(CaCO3): n(Al2O3)=12: 7) was dissolved in 100 mL ethyl alcohol at 70 AdegC for 1.5 h, followed with addition of 0-10 wt% carbon black.
As well, a probabilistic sensitivity analysis (PSA) was performed over 10,000 simulations to capture the uncertainty in several parameters in the model, namely, hazard ratios of survival and inception of dialysis, daily doses, and unit costs of sevelamer and CaCO3.
Factor 1 is dominated by sand, CEC and CaCO3 in the soil samples of alfalfa farms or clay content, OM, CEC, total content of Fe, Mn and Zn and available Fe and Mn in the soil samples of corn farms, which amounted to 25.7% and 44% of the total variance, respectively.
Sample###Area###Total Hardness as CaCO3 (mg/L)###pH
All samples were dried, weighed, crushed, split and milled prior to XRF analysis for major oxides, determination of LOI (100-1000 degrees C) and determination of CaCO3 and MgCO3 by back titration methods.
The coal briquettes used in this work were made by mixing the coal samples (Table 1) with Poly Vinyl Acetate (PVA) and CaCO3 in varying compositions.
to be the latter's authorized distributor in the Philippines for its wide range of calcium carbonate (CaCO3) products.
They capture CO2 in the temperature range 400-800 AC via the formation of calcium carbonate (CaCO3) which can be regenerated with subsequent release of CO2, ready for compression and storage.
The mechanical properties for this ternary composite HDPE/OMMT/CaCO3 with a ratio of 12.33% CaCO3 and 3% OMMT were also listed in Table 2.
Combine carbon dioxide with seawater and you get calcium carbonate (CaCo3).