Calcium carbonate

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Notion

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Science and technology

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What Wikipedia says

Calcium carbonate is a chemical compound with the chemical formula CaCO3. It is a common substance found in rocks as the minerals calcite and aragonite, most notably in chalk and limestone, eggshells, gastropod shells, shellfish skeletons and pearls.

Excerpt from the Wikipedia article “Calcium carbonate”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Picture taken August 2005 by User:Walkerma., Public domain, via Wikimedia Commons.