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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.

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.

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.

calcium carbonate

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

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
References in periodicals archive ?
Pfizer Consumer Healthcare has rolled out Caltrate Bone & Joint Health, described as a triple-action supplement to promote bone health.
Pfizer said that the once-daily Caltrate Bone & Joint Health, now available exclusively at Walgreens stores, provides three benefits in one supplement: UC-II, an exclusive form of collagen, to support healthy cartilage and promote joint flexibility; calcium and vitamin D3, to nourish strong and healthy bones; and vitamin C and minerals, to support collagen production for healthy bones and skin.
The Buzz: "The same Caltrate that helps prevent bone loss may help keep your colon healthy, too.
The Basics: Caltrate Colon Health contains 600 milligrams of calcium from calcium carbonate and 200 International Units of vitamin D per tablet.
Products like Centrum, Advil, and Caltrate and other Nutrition products helped boost revenues.
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.
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.
The effect of Caltrate brand supplements on colon health was highlighted in a groundbreaking study, published in the New England Journal of Medicine, which demonstrated how adequate calcium intake may help reduce the risk of recurrence of colorectal adenomas (a.
Wyeth-Ayerst announced over $200 Million in capital expansion projects, at both their Guayama site, which manufactures Caltrate vitamins and at their Carolina site (Lederle Division), which produces injectables including Zozyn and synthetic penicillin.
Consumer purchasing of dietary supplements such as Calcium and brands Caltrate, Citracal, and Oscal has helped fuel the increase in spending for this disease.
Other PCH brands include Caltrate, ChapStick, Robitussin, Emergen-C, ThermaCare and Preparation H.
Multichannel * Brand Manufacturer Dollar Sales Total Sales $3,301,572,000 Private Label 1,192,434,000 Nature Made Pharmavite 299,344,900 Nature's Bounty NBTY 280,425,900 Sundown Naturals NBTY 102,121,000 Osteo Bi-Flex 5-toxin Advanced NBTY 97,680,340 Schiff Mega Red Reckitt Benckiser 90,140,990 Align Procter & Gamble 68,828,580 Citracal Bayer Consumer Health 66,502,100 Caltrate Pfizer 65,939,340 Culturelle i-Health 62,747,140 % Change Dollar % Change Brand vs.