The word gypsum is derived from the Greek word γύψος (gypsos), "plaster". Because the quarries of the Montmartre
Gypsum … See more

Gypsum is moderately water-soluble (~2.0–2.5 g/L at 25 °C) and, in contrast to most other salts, it exhibits retrograde solubility, becoming less soluble at higher temperatures. When gypsum is heated in air it loses … See more

Gypsum occurs in nature as flattened and often twinned crystals, and transparent, cleavable masses called selenite. Selenite contains no significant selenium; rather, both substances were named for the ancient Gre… See more

Gypsum is a common mineral, with thick and extensive evaporite beds in association with sedimentary rocks. Deposits are known to occur in strata from as far back as the Archaean eon. Gypsum is deposited from lake and se… See more

Commercial quantities of gypsum are found in the cities of Araripina and Grajaú in Brazil; in Pakistan, Jamaica, Iran (world's second largest producer), Thailand, Spain (the main producer in Europe), Germany, Italy, England, Ir… See more

Synthetic gypsum is produced as a waste product or by-product in a range of industrial processes.
Flue gas desulfurization gypsum (FGDG) is recovered at some coal-fired power plants. The main c… See more