page_title: Calcium carbonate
section_title: See also
hierarchical_section_title: Calcium carbonate / See also
caption_attribution_description: Čeština: krystaly uhličitanu vápenátého - usazenina z rychlovarné konvice English: limescale - calcium carbonate crystals
context_page_description: Calcium carbonate is a chemical compound with the formula CaCO₃. It is a common substance found in rocks as the minerals calcite and aragonite and is the main component of pearls and the shells of marine organisms, snails, and eggs. Calcium carbonate is the active ingredient in agricultural lime and is created when calcium ions in hard water react with carbonate ions to create limescale. It is medicinally used as a calcium supplement or as an antacid, but excessive consumption can be hazardous and cause poor digestion.
context_section_description: Cuttlebone
  Cuttlefish
  Gesso
  Limescale
  Marble
  Ocean acidification
  Whiting event
  List of climate engineering topics
  Lysocline
caption: Electron micrograph of needle-like calcium carbonate crystals formed as limescale in a kettle
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