Limestone is common a rock that makes up about ten percent of all sedimentary rocks. Limestone is made up of calcite aragonite. A lot of limestone comes from skeletal fragments of marine organisms. Throughout history, many people have recognized limestone’s potential and used it for a building material. The great pyramids of Egypt, among many other landmarks, are constructed of limestone. It was also very popular in the Middle Ages, due to its hardness, durability, and availability. Many medieval churches and other structures still standing are made of limestone. Limestone is also used as a pigment in toothpaste.
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