Gypsum is chemically termed as Calcium Sulphate dihydrate (CaSO4 2H2O). There are three broad kinds of gypsum which are found across the world.
Naturally gypsum is found below the earth’s surface like other minerals and this gypsum is called Natural Gypsum. The Natural gypsum is mined and extracted below the earth’s
surface using conventional means. In India, natural gypsum is found largely in Rajasthan.
Gypsum is also formed as a by-product of the salt manufacturing process and this gypsum is called Marine gypsum. In India marine gypsum is found in Tuticorin and Gujarat where the salt pans exist.
Thirdly gypsum is also formed as a by-product of industrial manufacturing processes like fertilizers, copper and power. The gypsum thus formed is called synthetic gypsum and is also referred to as phosphor gypsum & DSG depending on the type of manufacturing process.
Details about Gypsum Plaster