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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.
Jupiterimages/Photos.com/Getty Images. Limestone is a sedimentary rock composed of a mineral called calcite, which has the chemical formula CaCO3. Together with the dolomites, a related class of sedimentary rocks, limestone makes up some 10 to 15 percent of all sedimentary rock on our planet.he first element found in limestone is calcium; the symbol for calcium is Ca. Calcium has atomic number 20, meaning it has 20 protons in its nucleus.