Noun
A mineral of a white or a slightly bluish color, usually massive. It is anhydrous sulphate of lime, and differs from gypsum in not containing water (whence the name).
Source: Webster's dictionarySupersulfated cements contain about 80% ground granulated blast furnace slag, 15% gypsum or anhydrite and a little Portland clinker or lime as an activator. Source: Internet
Examples include barite (BaSO 4 ), celestine (SrSO 4 ), and anglesite (PbSO 4 ); anhydrite is not part of the barite group, as the smaller Ca 2+ is only in eight-fold coordination. Source: Internet
The anhydrous equivalent of gypsum is anhydrite ; it can form directly from seawater in highly arid conditions. Source: Internet