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Limestone is a sedimentary rock composed primarily of calcium carbonate (CaCO 3) in the form of the mineral calcite. It most commonly forms in clear, warm, shallow marine waters.It is usually an organic sedimentary rock that forms from the accumulation of shell, coral, algal and fecal debris.It can also be a chemical sedimentary rock formed by the precipitation of calcium carbonate from lake or ocean water. Most limestones form in shallow, calm, warm marine waters.t is usually an organic sedimentary rock that forms from the accumulation of shell, coral, algal and fecal debris. It can also be a chemical sedimentary rock formed by the precipitation of calcium carbonate from lake or ocean water. Most limestones form in shallow, calm, warm marine waters.
1 One of the largest areas of limestone [limestone: A sedimentary rock consisting mainly of calcium carbonate. 2  It is commonly used as a building stone. ] 3  in the UK is found in the Yorkshire Dales National Park, near Malham and Ingleton. 4  Limestone is a sedimentary rock made of calcium carbonate.