. Minerals are unevenly distributed in various regions of India. . Peninsular rocks contain most of the reserves of coal, metallic minerals, mica and many other non-metallic minerals. . Sedimentary rocks on the western and eastern flanks of the peninsula, in Gujarat and Assam have most of the petroleum deposits. . Rajasthan with the rock systems of the peninsula, has reserves of many non-ferrous minerals. . The vast alluvial plains of North India are almost devoid of economic minerals.