Mineral Name: Fluorite Chemical Formula: CaF2 - Calcium Fluoride Color: Fluorite exhibits a wide range of colors, including purple, blue, green, yellow, pink, brown, and colorless. The color variation is often due to impurities or exposure to natural radiation during crystal growth. Crystal System: Isometric Hardness: 4 on the Mohs scale Luster: Vitreous Transparency: Transparent to translucent Specific Gravity: 3.18 - 3.25 Cleavage: Perfect in four directions forming octahedrons Fracture: Subconchoidal to uneven Streak: White Occurrences: Fluorite is commonly found in hydrothermal veins, sedimentary rocks, and as a gangue mineral in ore deposits. It often occurs alongside minerals such as quartz, calcite, and sphalerite. Major deposits are found in China, Mexico, the United States, and various European countries. Notable Localities: Some famous fluorite localities include the Cave-in-Rock mine in Illinois, USA; the Okorusu mine in Namibia; and the Rogerley Mine in County Durham, England. Formation: Fluorite forms in a variety of geological settings but is often associated with hydrothermal activity. It crystallizes in isometric cubic forms and can develop into well-formed cubes, octahedrons, or dodecahedrons. The different colors of fluorite are attributed to impurities or color centers within the crystal lattice. Unique Features: Fluorite crystals are known for their distinctive cubic habit, and they often display interesting zoning patterns where different color zones occur within a single crystal. Some fluorite crystals may also exhibit fluorescence under ultraviolet (UV) light, emitting a vibrant glow in various colors. The mineral is valued for its beauty, transparency, and the range of colors it can exhibit. Uses: Fluorite has both industrial and ornamental uses. In industry, fluorite is a source of fluorine for various chemical applications. As a gemstone, fluorite is popular in jewelry and as a collector's item for its vibrant colors and unique crystal forms. Certain varieties of fluorite, especially those exhibiting fluorescence, are particularly sought after by collectors. Caution: Fluorite itself is generally safe to handle, but some specimens may contain impurities or trace elements that could be harmful. As with any mineral specimen, it is advisable to wash hands thoroughly after handling and to avoid ingestion or inhalation of dust particles.