A calcium fluoride crystal, Fluorite unfolds in cubic forms, revealing a spectrum of colors that seems to capture the rainbow: violet, green, yellow, blue, pink, or black. Under UV light, it begins to sparkle, sometimes phosphorescent, sometimes triboluminescent as if holding a secret brilliance waiting to be revealed. Often found alongside other minerals such as quartz, calcite, or sulfides, it occurs in China, Mexico, the United States, and France, particularly in Aveyron and the Pyrenees. Today admired as a decorative object, Fluorite was once used as a flux in metallurgy, offering a bridge between mineral beauty and historical utility, a crystal that enlightens both the gaze and the mind.