Scheelite, a mineral composed of calcium tungstate, is commonly spelled /ˈʃiːlaɪt/ in English. The first syllable is pronounced as "shee" with a long vowel sound /iː/, followed by the "l" sound represented by the letter "l". The second syllable is pronounced as "light" with a diphthong /aɪ/ and a final unvoiced "t" sound. The word is derived from its discoverer, Swedish chemist Carl Wilhelm Scheele, and its spelling follows the German pronunciation convention, which uses "sch" to represent the consonantal sound /ʃ/.
Scheelite is a noun that refers to a mineral with the chemical formula CaWO4, a calcium tungstate. It belongs to the tungstate mineral group and is often categorized as a tungsten ore. The word "scheelite" originates from the German mineralogist Carl Wilhelm Scheele, who discovered it in 1781.
In terms of physical characteristics, scheelite typically appears in various colors, including white, yellow, brown, or even shades of green or blue. It possesses a vitreous luster when polished and has a white streak. The mineral commonly forms prismatic or tabular crystals, but it can also occur as granular or massive aggregates.
Scheelite has a significant economic importance due to its high tungsten content, as tungsten is an extremely durable and heat-resistant metal. As a result, scheelite serves as a crucial source for tungsten extraction, which finds applications in multiple industries. It is widely used in the production of alloys, such as steel and other high-strength materials, as well as in electrical and electronic equipment, light bulbs, and various types of machinery.
Geologically, scheelite is mainly found in hydrothermal veins that form from hot fluids circulating within the Earth's crust. It often occurs alongside other minerals like molybdenite, fluorite, and calcite. Notable scheelite deposits can be found in countries such as China, Russia, Bolivia, Australia, and the United States. Continuous exploration and mining of scheelite are essential for meeting the growing demand for tungsten.
Tungstate of lime, found in the veins of the older rocks in four-sided pyramidal crystals, or in granular crusts of a grey, white, yellow, or brownish colour.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "scheelite" is derived from the name of the Swedish chemist and mineralogist, Carl Wilhelm Scheele (1742-1786). Carl Scheele is credited with the discovery of the element tungsten, and the mineral scheelite, which is a calcium tungstate. In honor of his contributions to the field, the mineral was named "scheelite" after him.