The fluorspar also called calcium fluoride, is a common halide mineral, it is a compound, its component is calcium fluoride, is an important mineral extraction fluorine. The fluorite There are many colors, and may be transparent and colorless. Transparent and colorless fluorite can be used to create special optical lens. The fluorite There many uses, such as steel-making, aluminum production with flux used to produce opal glass, ceramic products, and catalyst in the production of high-octane fuel. The fluorite General grainy or lumpy, and for more than a shiny glass, green or purple. Fluorite often makes the blue-green fluorescence in the ultraviolet or cathode ray irradiation, and its name from this feature. Mohs hardness: 4. Density: 3.18 (+ 0.07, - 0.18) g / cm 3. Refractive index: 1.434 (± 0.001)