mineral
Anhydrite
Calcium Sulfate (CaSO4)
AI-generated identification · may be incorrectHardness of 3-3.5 on the Mohs scale, typically white, bluish-grey, or colorless with a vitreous to pearly luster. It exhibits three directions of good cleavage meeting at right angles, often resulting in cubic or rectangular fragments.
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Physical properties
Hardness of 3-3.5 on the Mohs scale, typically white, bluish-grey, or colorless with a vitreous to pearly luster. It exhibits three directions of good cleavage meeting at right angles, often resulting in cubic or rectangular fragments.
Formation & geological history
Forms through the evaporation of saline water in arid environments or the dehydration of gypsum under burial pressure. Found in sedimentary evaporite deposits worldwide.
Uses & applications
Used primarily in the manufacture of cement, soil conditioning in agriculture, and as a desiccant or filler in industrial applications.
Geological facts
Anhydrite means waterless in Greek, referring to the absence of crystal water compared to gypsum. When exposed to moisture over long periods, it slowly absorbs water and converts back into gypsum.
Field identification & locations
Identified by its distinctive right-angle cleavage and relative softness, easily scratched by a copper coin. Commonly collected from evaporite mines and salt basin deposits.
