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limestone

石灰石

Limestonesedimentary rock composed mainly of calcium carbonate (CaCO3), usually in the form of calcite or aragonite.
(Source: https://www.britannica.com/science/limestone)

Limestone comprises about 15% of the Earth’s sedimentary crust. It is a basic building block of the construction industry (dimension stone) and a chief material from which aggregate, cement, lime and building stone are made.
(Source: https://mineralseducationcoalition.org/minerals-database/limestone/)

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