Quicklime

Calcium oxide, commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature. The broadly used term lime connotes calcium-containing inorganic compounds, in which carbonates, oxides, and hydroxides of calcium, silicon, magnesium, aluminium, and iron predominate.

By contrast, quicklime specifically applies to the single compound calcium oxide.
Calcium oxide that survives processing without reacting in building products, such as cement, is called free lime.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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