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Fluorine is a species commonly present in many minerals in the Earth's interior, with a concentration ranging from a few ppm to more than 10 wt. %. Recent experimental studies on fluorine-bearing silicate minerals have proposed that fluorine might be an important charge carrier for electrical conduction of Earth materials at elevated conditions, but the results are somewhat ambiguous. In this investigation, the electrical conductivity of gem-quality natural single crystal fluorite, a simpledoi:10.3390/min9020072 fatcat:oxn6ndlzzvdwnjuusib4c7hbsi