Limestone Rock

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Limestone is a carbonate sedimentary rock that is often composed of the skeletal fragments of marine organisms such as coral , foraminifera , and molluscs . Its major materials are the minerals calcite and aragonite , which are different crystal forms of calcium carbonate (CaCO 3 ). A closely related rock is dolomite , which contains a high percentage of the mineral dolomite , CaMg(CO 3 ) 2 . In old USGS publications, dolomite was referred to as magnesian limestone , a term now reserved for magnesium-deficient dolomites or magnesium-rich limestones.