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Limestone and Chalk. Limestone is a sedimentary rock consisting principally of the mineral calcite (calcium carbonate) and is widely distributed in Alabama. The limestones of Alabama have a wide variety of chemical and physical properties and have been used for various purposes throughout human history in the region.
Limestone means any rock formed mostly of calcium carbonate (CaCO 3), but to geologists, limestone is only one of several types of carbonate rocks. These rocks are composed of more than 50% carbonate minerals, generally the minerals calcite (pure CaCO 3) or dolomite (calcium-magnesium carbonate, CaMg[CO 3] 2) or both.