| http://www.w3.org/ns/prov#value | - This fluoride typically occurs in the earths crusts as fluorspar(CaF2), rock phosphate, cryolite (Na3AlF6), apatite(Ca5(PO4)3F), mica, and hornblende.[2] Fluorine is the most electronegative element and is extremely reactive, rarely found outside of its ionic form, fluoride.[2]The fluoride then leaches off of these minerals and into the groundwater.
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