MINERAL WEALTH. Tamil Nadu is endowed with major minerals such as Limestone, Magnesite, Graphite, Bauxite, Iron Ore, Vermiculite, minor minerals such as Granites, Clay, Silica sand, Lignite, fuel minerals such as Petroleum and Natural Gas and atomic minerals such as Monazite, Rutile, Ilmenite. The details of the these minerals are as follows:Web