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.
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2012 State of Florida