fluorspar /ˈflʊəˌspɑː/ (also fluor)

• 1. 

  N a white or colourless mineral sometimes fluorescent and often tinted by impurities, found in veins and as deposits from hot gases. It is used in the manufacture of glass, enamel, and jewellery, and is the chief ore of fluorine. Composition: calcium fluoride. Formula: CaF2. Crystal structure: cubic 荧石 (See also fluorite)