Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate. Gypsum also crystallizes as translucent crystals of selenite. It forms as an evaporite mineral and as a hydration product of anhydrite.
Usage of Gypsum Powder:
Agriculture; Construction industry; Modeling, sculpture and art; Food and drink; Medicine and cosmetics and other.
It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard/sidewalk chalk, and drywall. A massive fine-grained white or a lightly tinted variety of gypsum, called alabaster, has been used for sculpture by many cultures including Ancient Egypt, Mesopotamia, Ancient Rome, the Byzantine Empire, and the Nottingham alabasters of Medieval England.
Hydrous calcium sulfate
Colorless (in transmitted light) to white; often tinged other hues due to impurities