POLISHING units of granite are found in the districts of Chittorgarh, Udaipur, and Jodhpur.Rajasthan is famous for its granite industry.There are more than 20 varieties of granites that are being marketed by the industry here.The most POPULAR MATERIALS from the Rajasthan granite industry are Desert Brown, Desert Green, and Devgarh Black which are types of granite.Granite is an example of igneous rock. Igneous rocks:Rocks formed by the cooling of molten matter beneath the EARTH’s surface are called intrusive igneous rocks.‘Granite’ and ‘Gabbro’ are the main examples of these rocks.Sometimes, the molten matter oozes out through cracks in the earth’s crust and spreads on the surface, forming extrusive igneous rocks.Gabbro, OBSIDIAN, Basalt, etc. are examples of extrusive igneous rocks.