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Florida Geological Survey - Geology Topics
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Identification: The mineral anhydrite is an anhydrous calcium sulfate (CaSO4). It is closely related to the mineral gypsum but has a marble-like texture and usually shows no crystal form.  Anhydrite has a white, gray, or brown color and a white streak and is distinguished from calcite by its superior hardness of 3.0 to 3.5. The specific gravity is 2.89 to 2.98.
Occurrence: Anhydrite occurs deep in the subsurface of the State and is a common mineral seen in well cores.


Last updated: July 01, 2015

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