These two references might ...

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These two references might be helpful.  You'd create the mineral Fluorite .

Turner Brett D, P Binning, and SLS Stipp (2005). Fluoride Removal by Calcite: Evidence for Fluorite Precipitation and Surface Adsorption. Environ Sci Technol 2005, 39, 9561-9568.

Turner Brett D, PJ Binning, and SW Sloan (2008). A calcite permeable reactive barrier for the remediation of Fluoride from spent potliner (SPL) contaminated groundwater. Journal of Contaminant Hydrology 95 (2008) 110–120.

Good luck.  J. Gusek