Buy Fluorite from Crystals By Nature. Fluorite is a mineral composed of calcium and chlorine, naturally occurring in all colors of the spectrum. From the Latin word "fluere" meaning "to flow", the term fluorescence is in fact derived from Fluorite. As one of the most popular minerals in the world, Fluorite is an abundant crystal that promotes many valuable healing properties, including psychic wholeness and development, peace, protection, while generating mental order and clarity. Available in an array of crystallized formations, it is easy to find a Fluorite crystal that exhibits the unique characteristics to which you are attracted.