What is Limestone?

Limestone is a sedimentary rock, which is composed of calcium carbonate (calcite) or the double carbonate of calcium and magnesium (dolomite) tiny fossils, shell fragments and other plants remains. It is formed over many years at the bottom of oceans or lakes from the accumulation of shells, bones and other calcium rich minerals. A limestone can metamorphose into marble, if it is subjected to intense heat or pressure, for over a long period of time.

Both limestone and marble, chemically contain calcium carbonate and the only difference, one can find will be of their appearance. Marble willhave a crystalline structure, whereas the limestone will have relatively flat appearance. Limestone is generally quite impervious and hard in nature.


  • Metallurgy : Steel Manufacture, Steel Products Manufacture, Magnesium Manufacture, Alumina Manufacture, Ore Flotation and Non-Ferrous Metal Smelting.
  • Pulp And Paper : Sulfate Process, Sulfite Process, Bleaching, Precipitated Calcium Carbonate, Strawboard Manufacture, and in the treatment of pulp and paper mill liquid wastes, as a coagulant in color removal.
  • Chemicals : Alkalis, Calcium Carbide and Cyanimide, Petrochemicals, Bleaches, Dye and Dyestuff Intermediates and Coke- By-Products. In addition, it is used in the purification of citric acid, glucose and dextrin; metallic calcium; soda-lime, an adsorbent; and for countless other minor or isolated purposes, such as for CO, absorption.