<P> It is a meta - silicate of calcium . It is mostly white in color and occurs as bladed or needle like crystals . As of 2010, India had 16 million tonnes of resource . Most of the deposits are available in Rajasthan (Dungarpur, Pali, Sirohi and Udaipur districts). Minor amount of deposits are found in Gujarat and Tamil Nadu . It is mainly used in ceramic industries and metallurgical applications . It is also used as a filler in wall tiles, paint, rubber and plastic . India is one of the largest reserves . In 2011, India produced 150,000 tons . It is mined by opencast method . It is also used as a substitute for short - fibre asbestos in brake - linings . Central Building Research Institute has found that wollastonite can be used as substitute for chrysotile asbestos in cement products . </P> <P> It is a group of metamorphic minerals - sillimanite, kyanite and andalusite . These are polymorphs of alumino - silicate . These are formed under high - pressure and high - temperature conditions . The three minerals are calcined to form mullite . Mainly used as refractory materials . As of 2010, India had 66 million tonnes of sillimanite, 100 million tonnes of Kyanite and 18 million tonnes of Andalusite as resource . Most of the resources are found in Tamil Nadu, Orissa, Uttar Pradesh, Andhra Pradesh, Kerala and Assam . Minor amount of resources are found in Jharkhand, Karnataka, Madhya Pradesh, Maharashtra, Meghalaya, Rajasthan and West Bengal . Granular sillimanite is available in beach sands of South India . Sillimanite refractory bricks are used in steel, glass and petrochemical industries . In 2004, India produced 14,500 tonnes of sillimanite and 6200 tonnes of kyanite . </P> <P> It is a compound of iron and titanium . It will be iron - black or steel - gray in color . It is a non-toxic material used in biomedical substances . Institute of Minerals and Materials Technology has developed an environmentally friendly technology for processing ilmenite . It is also used in production of titanium dioxide pigment . It is available in Kerala, Tamil Nadu and Orissa . Mining is done at Chavara, Chatrapur, Aluva and Manavalakurichi by Indian Rare Earths limited . As of 2013, India has 21% of the world's reserves and constitutes 6% of the world's production . </P> <P> It is a hydrous alumino - silicate . It is chemically inert, has high melting point and low electrical conductivity . It is used in refractories, foundry dressings, pesticides, ceramics and rubber . It is available as hydrothermal deposits . The physical and optical properties are pyrophyllite are similar to talc . It is also used in electrical insulators, sanitary - ware and in the glass industry . As of 2010, India had 56 million tonnes of this resource . Most of the resources are found in Madhya Pradesh (Chhatarpur, Tikamgarh and Shivpuri districts). The remaining resources are found in Orissa, Uttar Pradesh, Andhra Pradesh, Maharashtra and Rajasthan . In 2010, India produced 1.5 million tonnes . </P>

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