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Additional
calcium carbonate
English Wikipedia - The Free Encyclopedia
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Calcium carbonate
Calcium carbonate
is a
chemical compound
with the
formula
Ca
C
O
3
. It is a common substance found in
rock
s as the
minerals
calcite
and
aragonite
(most notably as
limestone
), and is the main component of
shells of marine organisms
,
snails
,
pearls
, and eggshells. Calcium carbonate is the active ingredient in
agricultural lime
, and is created when calcium ions in
hard water
react with
carbonate ions
creating
limescale
. It is commonly used medicinally as a
calcium
supplement or as an
antacid
, but excessive consumption can be hazardous.
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