Anhydriittinä

Anhydriitti is the Swedish term for anhydrite, a mineral composed of anhydrous calcium sulfate (CaSO4). It is a member of the sulfate mineral group and is distinct from gypsum, which is a hydrated form of calcium sulfate (CaSO4·2H2O). Anhydrite is known for its hardness, which is greater than gypsum, and its lack of plasticity. The name anhydrite comes from the Greek words "anhydros" meaning "without water," reflecting its anhydrous nature.

Anhydriittinä is typically found in evaporite deposits, forming through the dehydration of gypsum, often in arid or semi-arid environments. It can also occur in sedimentary rocks, volcanic rocks, and as a gangue mineral in some hydrothermal ore deposits. Its common colors range from white and gray to bluish and sometimes reddish or brownish due to impurities. Anhydrite has a vitreous to pearly luster and a relatively high specific gravity.

In industrial applications, anhydriittinä plays a role as a component in cement production, particularly in Portland cement, where it acts as a set retarder. It is also used as a filler in plastics, paints, and paper, and in the manufacturing of sulfuric acid. Furthermore, anhydrite can be a source of sulfur and calcium for agricultural purposes, although gypsum is more commonly used for soil conditioning due to its hydration. Its presence in geological formations can also influence rock properties and behavior in underground mining and construction.