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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 is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO 3). Glass making, in some circumstances, uses limestone. 2  It is added to toothpaste, paper, plastics, paint, tiles, and other materials as both white pigment and a cheap filler. 3  It can suppress methane explosions in underground coal mines. 4  Purified, it is added to bread and cereals as a source of calcium.