FLUORITE MINERALI have created this material that I find very interesting and beautifulTrigger: fluorite mineral, flu0rite, iridiscentFluorite (also called fluorspar) is the mineral form of <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Calcium_fluoride">calcium fluoride</a>, CaF2. It belongs to the <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Halide_mineral">halide minerals</a>. It crystallizes in <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Cubic_crystal_system">isometric</a> <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Crystal_habit">cubic habit</a>, although octahedral and more complex isometric forms are not uncommon.The <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Mohs_scale_of_mineral_hardness">Mohs scale of mineral hardness</a>, based on <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Scratch_hardness">scratch</a> <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Hardness_comparison">hardness comparison</a>, defines value 4 as fluorite.<a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Fluorite#cite_note-6">[6]</a>Pure fluorite is colourless and transparent, both in visible and ultraviolet light, but impurities usually make it a colorful mineral and the stone has ornamental and <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Lapidary">lapidary</a> uses. Industrially, fluorite is used as a <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Flux_(metallurgy)">flux</a> for smelting, and in the production of certain glasses and enamels. The purest grades of fluorite are a source of fluoride for <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Hydrofluoric_acid">hydrofluoric acid</a> manufacture, which is the intermediate source of most fluorine-containing <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Fine_chemical">fine chemicals</a>. Optically clear transparent fluorite has anomalous partial <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Dispersion_(optics)">dispersion</a>, that is, its refractive index varies with the wavelength of light in a manner that differs from that of commonly used glasses, so fluorite is useful in making <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Apochromat">apochromatic lenses</a>, and particularly valuable in photographic optics. Fluorite optics are also usable in the far-ultraviolet and mid-infrared ranges, where conventional glasses are too opaque for use. Fluorite also has low dispersion, and a high refractive index for its density.

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