Gypsum is a very soft mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4•2H2O.

Gypsum is moderately water-soluble and, in contrast to most other salts, it exhibits a retrograde solubility, becoming less soluble at higher temperatures.

Gypsum crystals are found to contain anion water and hydrogen bonding.

Gypsum is a component of Portland cement used to prevent flash setting of concrete.

It is delivered in bulk