Sources and uses of fluorine
Fluorine is found in the mineral fluorite, which is also sometimes called fluorspar or Fluor .It is made up most commonly of the elements calcium and fluoride. Steel makers use fluorite during the process of making steel. Ultraviolet radiation causes fluorite crystals to fluoresce, or give off light. This occurs because fluorite atoms absorb energy form ultraviolet radiation. This energy cause electrons inside the atoms to become excited. When these electrons fall back into their normal state, the absorbed energy is released as light. The light given off by fluorite minerals, called fluorescence, is essential in the making of fluorescent lighting.