calcium carbonate
A salt (CaCO 3 ), occurring naturally,
usually in sea deposition, and prepared
commercially by passing carbon dioxide either
through cold lime water, which precipitates the
calcite crystalline type, or hot lime water, which
gives the aragonite crystalline type. The calcite
is the thermodynamically stable form. Calcium
carbonate is sometimes precipitated into paper by
suitable chemical reactions to deacidify the
paper, and is also used both as a filler and a
coating pigment in the manufacture of paper. (31 , 67 , 143 )
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