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.
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 It might be outdated or ideologically biased.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 ?
Send your name and address to Caltrate Plus/The Mirror Giveaway, PO Box 216, Aylesbury, Buckinghamshire, HP20 1DD.
Another popular calcium supplement is Lederle's Caltrate. According to a spokesman at Prime Natural Health Labs, the coming trend will be calcium-plus supplements, such as calcium-plus vitamin D and calcium-magnesium-zinc tablets.
price Unit sales Unit sales LEADING BRANDS ** per unit (000) % change Private Label $10.45 9,047 + 4.6% Nature's Bounty 10.08 3,670 - 9.9% Nature Made 10.81 2,124 + 3.4% Sundown Naturals 10.76 642 - 9.3% Culturelle 25.47 353 + 12.2% Prevagen 48.92 349 + 49.0% Caltrate 12.82 327 - 4.5% C itracal 13.37 285 - 16.8% Mason Natural 7.95 257 + 32.9% Align 34.36 256 + 8.8% * Total of drug stores, supermarkets, discount stores, military commissaries, and selected dub and dollar stores.
Tums is made from calcium carbonate, the same calcium source as in many other calcium supplements, such as Caltrate.
Three of PCH's most iconic brands--Advil, Caltrate and Centrum--are the No.
-- Pfizer Consumer Healthcare has rolled out Caltrate Bone & Joint Health, described as a triple-action supplement to promote bone health.
The Buzz: "The same Caltrate that helps prevent bone loss may help keep your colon healthy, too." So proclaims Wyeth about its newest calcium supplement, packaged specifically for people worried about their colon health.
price Unit sales Unit sales LEADING BRANDS ** per unit (000) % change Private Label $10.26 8,689 -1.9% Nature's Bounty 9.62 3,973 +8.8% Nature Made 10.87 1,985 -5.5% Sundown Naturals 9.78 679 -15.1% Culturelle 24.68 368 +24.9% Caltrate 12.50 311 +10.6% Citracal 13.52 303 -11.3% Nature's Bounty Q-Sorb 22.44 265 -1.2% Prevagen 45.77 264 +166.8% Osteo Bi-Flex 5 Loxin Advanced 21.56 233 -28.1% * Total of drug stores, supermarkets, discount stores, military commissaries, and selected club and dollar stores.
(If you take other supplements, be sure not to overdo vitamin D.) Brand # Pills to Get Vitamin 1,000-1,200 D mg Calcium (IU) Caltrate 600 Plus 2 [check] Vitamin Shoppe Osteo Protector 2 - GNC Women's Daily Calcium Support 3 - [check] Schiff Bone Builder 3 [check] TwinLab Bone Support 3 [check] Dr.
(+0.4%) LEADING BRANDS** Market Dollar sales Dollar sales share (000) % change Private Label 910.30 8,693 00000 Nature's Bounty 9.73 4,093 +8.5% Nature Made 10.92 2,091 +4.8% Sundown Naturals 9.58 770 -9.5% Caltrate 12.59 338 +12.1% Culturelle 25.90 331 +17.5% Citracal 13.65 325 -7.6% Nature's Bounty Q-Sorb 22.11 264 -10.1% Prevagen 45.79 256 +266.8% Osteo Bi-Flex 5 Loxin Advanced 21.31 238 -44.0% * Total of drug stores, supermarkets, discount stores, military commissaries and selected club and dollar stores.
Several brands of bone formula are on the market that provide 200 to 400 IU of vitamin D and 300 to 600 milligrams of calcium, such as Caltrate, Calcet, Citracal Plus D and Oscal Plus D.