durg and Ratnagiri), Chhattisgarh (Ballarpur and Durg districts), and Tamil nadu. National Aluminium Company Limited, abbreviated as NALCO, (incorporated ) has units in Odisha at places like Angul and Damanjodi. It was incorporated as a public sector enterprise under the Ministry of Mines, Government of India in . b) Non-Metallic Minerals These minerals do not contain metal in them.
Mica, limestone, gypsum, nitrate, potash, dolomite, coal, petroleum, etc., are the non- metallic minerals. Mica In ancient time, Mica was used in ayurvedic medicine. Mica became very popular with the development of electrical industry. Abhrak is a good quality mica.
It is translucent, easily splitable into thin sheets, flat, colourless, elastic and incompressible. Mica is used in making of insulating properties, as it withstands high voltage and has low power loss factor. Since it is a non-conductor of electricity, it is exclusively used in electrical goods. It is also used in making of lubricants, medicines, paints and varnishes.
The major deposits of mica are found in Andhra Pradesh, Rajasthan, Odisha and Jharkhand. Lime Stone Limestone is associated with rocks composed of either calcium carbonate or the double carbonate of calcium and magnesium or mixture of both. Limestone also contains small quantities of silica, alumina, iron oxides, phosphorous and sulphur. Limestone is used in the industries of chemicals for soda ash, caustic soda, bleaching powder, paper, cement, iron and steel, glass and fertilizers.
The major producing areas: Karnataka, Andhra Pradesh, Telangana, Rajasthan, Madhya Pradesh, Tamil Nadu, Meghalaya, Gujarat and Chhattisgarh. Gypsum Gypsum is a hydrated sulphate of calcium which occurs as white, opaque or transparent minerals in beds of sedimentary rocks such as limestone, sandstone and shale. Gypsum is used in the manufacture of cement, fertilizers, wall board, plaster of paris and in soil conditioning. Rajasthan, Tamil Nadu, Gujarat, Himachal Pradesh, Karnataka, Uttarakhand, Andhra Pradesh and Madhya Pradesh are the major producers.