Gypsum is formed by evaporation of water in the [[1]].

When water evaporates in a mineral-rich marine soil environment forms Gypsum.

Calcium sulphate dihydrate is what makes gypsum (CaSO₄ 2H₂O). It is a naturally occurring mineral found in specific kinds of sedimentary rocks. In locations with maritime soil that is rich in minerals, gypsum occurs when water evaporates. Evaporation slowly raises additional minerals to the soil's surface over time, eventually forming a solid deposit.

Therefore, gypsum is formed by the evaporation of water in the soil.