calcium carbonate

(redirected from surpass)
Also found in: Dictionary, Thesaurus, Medical, Legal, Idioms, Wikipedia.

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.
..... Click the link for more information.
 (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.
..... Click the link for more information.
.

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 ?
Surpass Software is offering early-purchase pricing through July 31, 2002, at $425.
According to the spokesman, consumer research from an ACNielsen BASES study last year found that 80% of those who tried Surpass said it worked as well as,
Implant the desire to surpass deeply into the company.
Nova's first Surpass injection grade of sLLDPE has a 0.
Additional Surpass film and molding resins will be introduced this year.
Whether or not a library circulates periodicals, Surpass Serials is essential to manage subscriptions, according to the announcement.
Surpass Software has announced that it's now bundling Surpass Central with Surpass Safari and offering them at a reduced price to libraries with 5,000 or fewer volumes.
Surpass Software has announced that users of the Surpass library automation suite of applications can now publish reports to the Web or save reports in other standard formats.
This feature combines with the ability to print patron photo-ID cards from within Surpass Central.
The Humphress Group and Precision Computer Service have announced that they have officially joined forces to do business as a unified company, Surpass Software.