Where does fluoride come from? Fluorite is used on a large scale to separate slag in steel-making. (chemistry) Any salt of hydrofluoric acid; for example, potassium fluoride. James Harrell 2012. Color zoning or banding is commonly present. Sodium fluoride and fluorite were historically used to fluoridate water. Fluorite also gave the name to its constitutive element fluorine. Flourite forms as a late-crystallizing mineral in felsic igneous rocks typically through hydrothermal activity. Fluorite should not be confused with fluoro-crown (or fluorine crown) glass, a type of low-dispersion glass that has special optical properties approaching fluorite. The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 4 as Fluorite. Fluoride science is DDT science. The fluorine anion, F -, or any of the compounds containing the anion are termed fluorides. In the St. Lawrence area, the veins are persistent for great lengths and several of them have wide lenses. [27], There are three principal types of industrial use for natural fluorite, commonly referred to as "fluorspar" in these industries, corresponding to different grades of purity. [11], The world reserves of fluorite are estimated at 230 million tonnes (Mt) with the largest deposits being in South Africa (about 41 Mt), Mexico (32 Mt) and China (24 Mt). Lv 4. Their transparence to ultraviolet light enables them to be used for fluorescence microscopy. Sometimes it can be a colorless crystal, but other times it can also be purple, blue, green, yellow, or pink, or other combinations of these colors. The structural motif adopted by fluorite is so common that the motif is called the fluorite structure. ronwizfr. Fluorite, also known as fluorspar, is the mineral form of calcium and fluorine (calcium fluoride or CaF 2).It is an industrial mineral used in the manufacture of chemicals, ceramic, and metallurgical processes. How do we get it? See Wiktionary Terms of Use for details. [18] The largest documented single crystal of fluorite was a cube 2.12 m in size and weighing ~16 tonnes. This is the form of fluorine that most commonly occurs in nature. Willmann-Bell, Inc. Reactivation of the St. Lawrence fluorspar mine at St. Lawrence, NL, CFI seeking a new location for shipping port in St. Lawrence, NL, "Caldoveiro Mine, Tameza, Asturias, Spain", "On the Change of Refrangibility of Light", Philosophical Transactions of the Royal Society of London, First direct evidence that elemental fluorine occurs in nature, Fluorine finally found in nature |Chemistry World, Educational article about the different colors of fluorites crystals from Asturias, Spain, https://en.wikipedia.org/w/index.php?title=Fluorite&oldid=988152011, Wikipedia articles in need of updating from December 2019, All Wikipedia articles in need of updating, Wikipedia articles incorporating text from the United States Geological Survey, Creative Commons Attribution-ShareAlike License. [34] The fluorite also serves to correct optical aberrations in these lenses. Fluorescence involves the elevation of electron energy levels by quanta of ultraviolet light, followed by the progressive falling back of the electrons into their previous energy state, releasing quanta of visible light in the process. With the advent of synthetically grown fluorite crystals in the 1950s - 60s, it could be used instead of glass in some high-performance optical telescope and camera lens elements. Multicolored Fluorite gemstones often show banding patterns. Fluorite objective lenses are manufactured by the larger microscope firms (Nikon, Olympus, Carl Zeiss and Leica). [35] Konica produced a fluorite lens for their SLR cameras – the Hexanon 300 mm f/6.3. It is sometimes called fluorspar. The highest grade, "acid grade fluorite" (97% or more CaF2), accounts for about 95% of fluorite consumption in the US where it is used to make hydrogen fluoride and hydrofluoric acid by reacting the fluorite with sulfuric acid. Iron, sodium, and barium are also common impurities. The color of fetid fluorite is predominantly due to the calcium atoms remaining. Therefore, ultraviolet light is not a reliable tool for the identification of specimens, nor for quantifying the mineral in mixtures. [2] Currently, the word "fluorspar" is most commonly used for fluorite as the industrial and chemical commodity, while "fluorite" is used mineralogically and in most other senses. Like iron and calcium, it dissolves into the groundwater that we draw on for our drinking water. Fluorite is an alternative name for one particular fluoride salt, calcuim fluoride ([math]CaF_2[/math]). In some countries, table salt is fluoridated. Every color of the rainbow in various shades is represented by fluorite samples, along with white, black, and clear crystals. Fluorite is a major source of hydrogen fluoride, a commodity chemical used to produce a wide range of materials. As an infrared optical material, calcium fluoride is widely available and was sometimes known by the Eastman Kodak trademarked name "Irtran-3", although this designation is obsolete. A golden yellow with hints of purple fluorite, Freestanding purple fluorite cluster between two quartzes, Transparent teal color fluorite with purple highlights, Grass-green fluorite octahedrons clustered on a quartz-rich matrix. Industrially, fluorite is used as a flux for smelting, and in the production of certain glasses and enamels. UCLA Encyclopedia of Egyptology, Gemstones. [32] Naturally occurring fluorite crystals without optical defects were only large enough to produce microscope objectives. [21], Recently discovered deposits in China have produced fluorite with coloring and banding similar to the classic Blue John stone. Neither does all fluorite fluoresce equally brightly, even from the same locality. Fluorite (also called fluorspar) is the mineral form of calcium fluoride, CaF2. Plus … When you hear about fluoride in drinking water, it comes from adding a fluorine compound (usually sodium fluoride, sodium fluorosilicate, or fluorosilicic acid) … Fluorite also exhibits the property of thermoluminescence.[26]. It’s tobacco science. September 27, 2017. 7 Fluorine is low on the periodic table—which is a sign of relative abundance—and is commonly found in its fluoride form in food, soil and even can be naturally found in water. [17], Cubic crystals up to 20 cm across have been found at Dalnegorsk, Russia. [12][needs update], One of the largest deposits of fluorspar in North America is located in the Burin Peninsula, Newfoundland, Canada. Fluoride is a mineral that occurs in all natural bodies of water around the world. [11] It is particularly common in granitic pegmatites. It is the 13 th most abundant element on the Earth’s crust; a chemical Ion of Fluorine. It belongs to the halide minerals. Nikon has previously manufactured at least one fluorite and synthetic quartz element camera lens (105 mm f/4.5 UV) for the production of ultraviolet images. Exposure tools for the semiconductor industry make use of fluorite optical elements for ultraviolet light at wavelengths of about 157 nanometers. Mining still takes place in Blue John Cavern and Treak Cliff Cavern. The best of such lens designs are often called apochromatic (see above). Colorless, although samples are often deeply colored owing to impurities; Purple, lilac, golden-yellow, green, blue, pink, champagne, brown.
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