Description
Specimen // Fluorite Locale // Illinois, USA This listing is for the exact crystal pictured above. It is 100% natural! "Fluorite is the mineral form of calcium fluoride, CaF2. It belongs to the halide minerals. It crystallizes in isometric cubic habit, although octahedral & more complex isometric forms are not uncommon. The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 4 as Fluorite. Pure fluorite is transparent, both in visible & ultraviolet light, but impurities usually make it a colorful mineral & the stone has ornamental & lapidary uses. Industrially, fluorite is used as a flux for smelting, & in the production of certain glasses & enamels. The purest grades of fluorite are a source of fluoride for hydrofluoric acid manufacture, which is the intermediate source of most fluorine-containing fine chemicals. Optically clear transparent fluorite lenses have low dispersion, so lenses made from it exhibit less chromatic aberration, making them valuable in microscopes & telescopes. Fluorite optics are also usable in the far-ultraviolet & mid-infrared ranges, where conventional glasses are too absorbent for use. " https://en.wikipedia.org/wiki/Fluorite Bicolor Illinois Fluorite/Crystal | Raw Flourite Stone Mineral Specimen Healing Grid Cube
