calcium carbonate

noun
a white, crystalline, water-insoluble, tasteless powder, CaCO 3 , occurring in nature in various forms, as calcite, chalk, and limestone: used chiefly in dentifrices and polishes and in the manufacture of lime and cement.

Origin:
1870–75

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Collins
World English Dictionary
calcium carbonate
 
n
a white crystalline salt occurring in limestone, chalk, marble, calcite, coral, and pearl: used in the production of lime and cement. Formula: CaCO3

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
calcium carbonate  
A white or colorless crystalline compound occurring naturally in chalk, limestone, and marble and in the minerals calcite and aragonite. It is used to make toothpaste, white paint, and cleaning powder. Chemical formula: CaCO3.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In reefs, all the builders die: the bricks are calcium carbonate shells.
The key ingredient is limestone, mostly calcium carbonate, the remains of
  shelled marine creatures.
Some formulations use calcium carbonate or even wood pulp instead.
Porcelain aids with drainage, and oyster shells bring calcium carbonate.
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