What is Gypsum
Gypsum (CaSO4· 2H2O) is a soft white, grey, brownish or slightly pink mineral consisting of hydrated calcium sulphate also know as calcium sulphate di-hydrate. It occurs mainly in sedimentary deposits and is used to for soil amelioration and in building construction materials. Gypsum is moderately water-soluble (~2.0–2.5 g/l at 25 °C) and, in contrast to most other salts, it exhibits
