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lime

File:Limestone_quarry.jpg · Wikimedia Commons · See Wikimedia Commons

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Also known as CaO, Ca(OH)2

calcium oxide or hydroxide

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Lime is a white powder made from calcium oxide or calcium hydroxide that has many industrial and practical uses. It matters because it's widely used in construction, water treatment, agriculture, and other applications that affect everyday life.

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Calcium oxide
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Limestone quarry in Brønnøy Municipality, Norway

Lime is an inorganic material composed primarily of calcium oxides and hydroxides. It is also the name for calcium oxide which is used as an industrial mineral and is made by heating calcium carbonate in a kiln. Calcium oxide can occur as a product of coal-seam fires and in altered limestone xenoliths in volcanic ejecta. The International Mineralogical Association recognizes lime as a mineral with the chemical formula of CaO. The word lime originates with its earliest use as building mortar and has the sense of sticking or adhering.

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