mining plaster of paris

Plaster of Paris is dehydrated gypsum Gypsum is a naturally forming nonmetallic mineral found as a rock or sand composed of 701 calcium sulphate and 209 water by weight Its chemical formula is CaSO 4 2H 2 O Gypsum is found naturally in most parts of the world In addition to mined gypsum there is Byproduct gypsum