In India, coal is the most abundantly available fossil forms depending on the degrees of compression and the depth and time of burial. Decaying plants in swamps produces Peat. It has a low carbon and high moisture contents and low heating capacity. Lignite is a low grade brown coal, which is soft with high moisture content. The principal lignite reserves are in Neyveli in Tamil Nadu and are used for generation of electricity. Coal that has been buried deep and subjected to increased temperatures in Bituminous coal. It is the most popular coal grade bituminous coal which has a special value for smelting iron in blast furnaces. Anthracite is the highest quality hard coal.