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Fluorite

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Fluorite (also called fluorspar) is the crystal form of the inorganic compound calcium fluoride. The term "fluorescence," a type of luminescence by a substance that has absorbed light or radiation, is derived from this mineral's name. When exposed to UV light, fluorite absorbs the light and temporarily glows (releases visible light). Fluorite is also used by chemists in the production of hydrofluoric acid.

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Science History Institute. Fluorite. Photograph, 2017. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/n583xv800.

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