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Scheelite is a calcium tungstate mineral with the chemical formula Ca W O 4. It is an important ore of tungsten (wolfram). Scheelite is originally named after Swedish chemist Carl Wilhelm Scheele (1742–1786).
Along with scheelite, the wolframite series are the most important tungsten ore minerals. Wolframite is found in quartz veins and pegmatites associated with granitic intrusives. [5] Associated minerals include cassiterite, scheelite, bismuth, quartz, pyrite, galena, sphalerite, and arsenopyrite.
Tungsten ore is a rock from which the element tungsten can be economically extracted. The ore minerals of tungsten include wolframite, scheelite, and ferberite.Tungsten is used for making many alloys.
State Route 839 (SR 839) is an 18-mile (29 km) road that runs from the Nevada Scheelite Mine to U.S. Route 50.The road is also known as Nevada Scheelite Mine Road. Prior to the 1976 mass renumbering of Nevada State Routes this road was a disconnected segment of State Route 31.
Mittersill is the largest scheelite deposit in Europe, having in 2010 estimated reserves of 6.1 million tonnes of ore grading 0.5% pure tungsten. [3] [4] The mine produces around 500.000 t ore grading 0.3 %WO 3, i.e., around 1,200 tonnes of WO 3 per year (data from 2010 to 2017) . [4] [2] [5]
It forms a solid solution series with scheelite (calcium tungstate, CaWO 4). It has refractive index values of n ω =1.974 and n ε =1.984. [3] Powellite was first described by William Harlow Melville in 1891 for an occurrence in the Peacock Mine, Adams County, Idaho, and named for American explorer and geologist, John Wesley Powell (1834 ...
Its associated minerals include pyrite, chalcopyrite, quartz, anhydrite, fluorite, and scheelite. Important deposits include the disseminated porphyry molybdenum deposits at Questa, New Mexico and the Henderson and Climax mines in Colorado. Molybdenite also occurs in porphyry copper deposits of Arizona, Utah, and Mexico.
Scheelite is treated similarly using sodium carbonate. Sodium tungstate can also be produced by treating tungsten carbide with a mixture of sodium nitrate and sodium hydroxide in a fusion process which overcomes the high exothermicity of the reaction involved. Several polymorphs of sodium tungstate are known, three at only one atmosphere ...
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