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Feldspar -

T Feldspars are one of the most abundant among rock forming minerals in the earth's crust. It comprises group of minerals consisting of aluminium silicate with potassium, sodium and calcium as mixture. It may also contain small amount of lithium, rubidium and barium as isomorphous admixtures of alkalies.
Feldspar is traditionally used as a source for alumina and alkali in ceramics & glass applications which account for 85-90% of total consumption of the mineral. It plays an important role as fluxing agents in ceramics and glass applications, and are also used as functional fillers in the paint, plastic, rubber and adhesive industries. Few firms in India are utilising feldspar as a bonding agent in the manufacture of bonded abrasive like wheels and discs of garnet, corrundum, emery etc. It is also used in the manufacture of artificial teeth, fertiliser and white cement. Certain varities of feldspars are used as semi precious stone e.g. moonstone which is orthocase colourless feldspars with white or bluish tints.
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