GEOLOGY & PLANETARY SCIENCE A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site anhydrite Anhydrite specimen from Chihuahua, Mexico, in the Harvard Museum of Natural History. Source: Wikipedia A mineral form of anhydrous calcium sulfate (CaSO4, see calcium), occurring worldwide as white-gray masses of orthorhombic crystals. Thick beds of anhydrite are formed where old seawater lagoons have evaporated. It is used in producing sulfuric acid and ammonium sulfate and as a drying agent. Hardness 3–3.5, specific gravity 3. See also gypsum. Related category    • GEOLOGY AND PLANETARY SCIENCE Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP