anhydrite
/anˈhʌɪdrʌɪt
/noun [mass noun]
A white mineral consisting of anhydrous calcium sulphate. It typically occurs in evaporite deposits.The lower, evaporitic part of each cycle contains halite, anhydrite (secondary after sedimentary gypsum), and high salts (sylvite and polyhalite)....
- Layering is defined by halite of different colours and grain size with various concentrations of different impurities (mainly red clay, buff anhydrite or green volcanic rocks).
- The Bonneval gneiss is separated from the augen gneiss by a fault zone in which dolomite, cargneule, anhydrite and Bündnerschiefer occur.
Origin
Early 19th century: from Greek anudros (see anhydrous) + -ite1.