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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.
Commodity: Limestone, a sedimentary rock that is dominantly composed of the calcium-bearing carbonate minerals calcite and dolomite. Calcite is chemically calcium carbonate (formula CaCO3). Dolomite is chemically calcium-magnesium carbonate (formula CaMg(CO3)2). It is used as a soil conditioner to neutralize acidity and to add calcium and magnesium nutrients. 2  Quicklime is calcium oxide (formula CaO) that is produced by calcining (burning) high-calcium limestone in a lime kiln to drive out the carbon in the form of carbon dioxide gas (formula CO2).