Douglas J. Cook, Anthony F. Randazzo, Craig L. Sprinkle; Authigenic fluorite in dolomitic rocks of the Floridan aquifer. Geology ; 13 (6): 390–391. doi: https://doi.org/10.1130/0091-7613(1985)13<390:AFIDRO>2.0.CO;2
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Fluorite in Eocene carbonate mudstone of Florida is reported for the first time. Fluorite occurs within primary gypsum nodules at a depth of 235–240 m below the surface. Water chemistry indicates undersaturation for gypsum and fluorite, and their survival is attributed to a lack of groundwater circulation. Fluorite probably formed penecontemporaneously with gypsum in a sabkha environment from seawater-concentrated brine. An additional source of fluoride may have been fluvial transport of salts weathered from Appalachian volcanic rocks.