calcium carbo-nates

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.
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