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Colemanite
Colemanite (Ca2B6O11·5H2O) or (CaB3O4(OH)3·H2O) is a borate mineral found in evaporite deposits of alkaline lacustrine environments. Colemanite is a secondary mineral that forms by alteration of borax and ulexite. It was first described in 1884 for an occurrence near Furnace Creek in Death Valley and was named after William Tell Coleman (1824–1893), owner of the mine "Harmony Borax Works" where it was first found. At the time, Coleman had alternatively proposed the name "smithite" instead after his business associate Francis Marion Smith. Uses Colemanite was the most important ore of boron Boron is a chemical element; it has symbol B and atomic number 5. In its crystalline form it is a brittle, dark, lustrous metalloid; in its amorphous form it is a brown powder. As the lightest element of the boron group it has three ... until the discovery of kernite in 1926. It has many industrial uses such as in heat resistant glass manufacturing. Occurrence ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eti Maden
Eti Maden is a Turkish state-owned mining and chemicals company focusing on boron products. It holds a government monopoly on the mining of borate minerals in Turkey, which possesses 72% of the world's known deposits. In 2012, it held a 47% share of global production of borate minerals, ahead of its main competitor, Rio Tinto Group, which held 23%. It is owned by the Turkey Wealth Fund. In 2012, it was the forty-first largest industrial company in Turkey, with an annual revenue of $850 million. It was founded in 1935 as Etibank, a bank created to finance Turkish natural resource extraction; in 1993, the company's banking activities were privatized, and its mining activities separated under the name Eti Holding A.Ş. In 2004, the company was restructured again and named Eti Mine Works. Its subsidiaries include AB Etiproducts OY, a Finland-based company which distributes Eti Mine Works products in Scandinavia, Eastern Europe, Russia, Central Asia, and Africa. Bandırma Borax owns ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inoborates
The Borate Minerals are minerals which contain a borate anion group. The borate (BO3) units may be polymerised similar to the SiO4 unit of the silicate mineral class. This results in B2O5, B3O6, B2O4 anions as well as more complex structures which include hydroxide or halogen anions.Klein, Cornelis and Cornelius Hurlbut, Jr., ''Manual of Mineralogy'', Wiley, 20th ed., 1985 pp. 343 - 347 The [B(O,OH)4]− anion exists as well. Many borate minerals, such as borax, colemanite, and ulexite, are Salt (chemistry), salts: soft, readily soluble, and found in evaporite contexts. However, some, such as boracite, are hard and resistant to weathering, more similar to the Silicate mineral, silicates. There are over 100 different borate minerals. Strunz classification, Strunz group V/G - V/L Borate minerals include: *Kernite Na2B4O< ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ulexite
Ulexite (), sometimes called TV rock or TV stone due to its unusual optical properties, is a hydrous borate hydroxide of sodium and calcium with the chemical formula . The mineral occurs as silky white rounded crystalline masses or in parallel fibers. Ulexite was named for the German chemist Georg Ludwig Ulex (1811–1883), who first discovered it. The natural fibers of ulexite act as optical fibers, transmitting light along their long axes by internal reflection. When a piece of ulexite is cut with flat polished faces perpendicular to the orientation of the fibers, a good-quality specimen will display an image of whatever surface is adjacent to its other side. The fiber-optic effect is the result of the polarization of light into slow and fast rays within each fiber, the internal reflection of the slow ray and the refraction of the fast ray into the slow ray of an adjacent fiber. An interesting consequence is the generation of three cones, two of which are polarized, when ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Minerals Named After People
This is a list of minerals named after people. The chemical composition of the mineral follows the name. A * Abelsonite: – American physicist Philip Hauge Abelson (1913–2004) * Abswurmbachite: – German mineralogist Irmgard Abs-Wurmbach (1938–2020) *Adamite: – French mineralogist Gilbert Joseph Adam (1795–1881) * Agrellite: – English optical mineralogist Stuart Olof Agrell (1913–1996) * Agricolaite: – German scholar Georgius Agricola (1494–1555) * Aheylite: – American geologist Allen V. Heyl (1918–2008) * Albrechtschraufite: – Albrecht Schrauf (1837–1897), professor of mineralogy, University of Vienna * Alexandrite: Variety of chrysoberyl (): – Russian monarch, Tsar Alexander II of Russia (1818–1881) * Alforsite: – American geologist John T. Alfors (1930–2005) * Allabogdanite: – Alla Bogdanova (1947 - 2004), Geological Institute, Kola Science Centre of Russian Academy of Sciences * Allanite series: sorosilicate – Scottish m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Minerals
This is a list of minerals which have Wikipedia articles. Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various ''species''. Within a mineral species there may be variation in physical properties or minor amounts of impurities that are recognized by mineralogists or wider society as a mineral ''variety''. Mineral variety names are listed after the valid minerals for each letter. For a more complete listing of all mineral names, see List of minerals recognized by the International Mineralogical Association. A :Varieties that are not valid species: *Adamantine spar (variety of corundum) *Agate (variety of chalcedony and quartz) *Alabaster (variety of gypsum) *Alexandrite (variety of chrysoberyl) *Allingite (synonym of amber) *Alum *Amazonite (variety of microcline) *Amethyst (purple variety of quartz) *Ametrine (variety of quartz) *Ammolite (organic; also a gemstone) *Amos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Tell Coleman
William Tell Coleman (1824–1893) was an American pioneer and politician who served as the Chairman of the San Francisco Committee of Vigilance. He later served two separate terms in the California State Assembly in 1859 and 1861. He was the Democratic candidate for U.S. Senate in 1865, but lost to Republican Cornelius Cole. Early life William Tell Coleman was born in Cynthiana in Harrison County, Kentucky on February 29, 1824. He was educated at St. Louis University in Missouri. Committees of Vigilance In 1849, Coleman arrived in California and eventually settled in San Francisco, where he engaged in the shipping and commission business. He first emerged as a leading figure in the 1851 Committees of Vigilance in the aftermath of a speech imploring the mob to conduct a formal, albeit illegal, court rather than lynch its targets immediately. Owing to the respect earned from this role, Coleman would be chosen to lead the larger 1856 Committee of Vigilance, which usurped civi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Francis Marion Smith
Francis Marion Smith (February 2, 1846 – August 27, 1931) was an American miner, business magnate and civic builder in the Mojave Desert, the San Francisco Bay Area, and Oakland, California. He was known nationally and internationally as "Borax Smith" and "The Borax King", as his company produced the popular '' 20-Mule-Team Borax'' brand of household cleaner. Frank Smith created the Key System, an interurban private transit system, which operated in Oakland and the East Bay with a terminus in the San Francisco Transbay Terminal. Early life Francis Marion Smith was born in Richmond, Wisconsin in 1846. He went to public schools and graduated from Milton Academy in Milton, Wisconsin. Early mining career At the age of 21, he left Wisconsin to prospect for mineral wealth in the American West, starting in Nevada. In 1872, while contracting to provide firewood to a small borax operation at nearby Columbus Marsh, Smith discovered a rich supply of ulexite at Teels Marsh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evaporite
An evaporite () is a water- soluble sedimentary mineral deposit that results from concentration and crystallization by evaporation from an aqueous solution. There are two types of evaporite deposits: marine, which can also be described as ocean deposits, and non-marine, which are found in standing bodies of water such as lakes. Evaporites are considered sedimentary rocks and are formed by chemical sediments. Formation Although all water bodies on the surface and in aquifers contain dissolved salts, the water must evaporate into the atmosphere for the minerals to precipitate. For this to happen, the water body must enter a restricted environment where water input into this environment remains below the net rate of evaporation. This is usually an arid environment with a small drainage basin fed by a limited input of water. When evaporation occurs, the remaining water is enriched in salts, and they precipitate after the water becomes saturated. Depositional environments ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyroelectric
Pyroelectricity (from Greek: ''pyr'' (πυρ), "fire" and electricity) is a property of certain crystals which are naturally electrically polarized and as a result contain large electric fields. Pyroelectricity can be described as the ability of certain materials to generate a temporary voltage when they are heated or cooled. The change in temperature modifies the positions of the atoms slightly within the crystal structure, so that the polarization of the material changes. This polarization change gives rise to a voltage across the crystal. If the temperature stays constant at its new value, the pyroelectric voltage gradually disappears due to leakage current. The leakage can be due to electrons moving through the crystal, ions moving through the air, or current leaking through a voltmeter attached across the crystal. Explanation Pyroelectric charge in minerals develops on the opposite faces of asymmetric crystals. The direction in which the propagation of the charge tends is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Minerals In Space Group 14
In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. (2011): Minerals'; p. 1. In the series ''Geology: Landforms, Minerals, and Rocks''. Rosen Publishing Group. The geological definition of mineral normally excludes compounds that occur only in living organisms. However, some minerals are often biogenic (such as calcite) or organic compounds in the sense of chemistry (such as mellite). Moreover, living organisms often synthesize inorganic minerals (such as hydroxylapatite) that also occur in rocks. The concept of mineral is distinct from rock, which is any bulk solid geologic material that is relatively homogeneous at a large enough scale. A rock may consist of one type of mineral or may be an aggregate of two or more different types of minerals, spacially segregated into distinct phases. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monoclinic Minerals
In crystallography, the monoclinic crystal system is one of the seven crystal systems. A crystal system is described by three Vector (geometric), vectors. In the monoclinic system, the crystal is described by vectors of unequal lengths, as in the orthorhombic system. They form a parallelogram prism (geometry), prism. Hence two pairs of vectors are perpendicular (meet at right angles), while the third pair makes an angle other than 90°. Bravais lattices Two monoclinic Bravais lattices exist: the primitive monoclinic and the base-centered monoclinic. For the base-centered monoclinic lattice, the primitive cell has the shape of an oblique rhombic prism;See , row mC, column Primitive, where the cell parameters are given as a1 = a2, α = β it can be constructed because the two-dimensional centered rectangular base layer can also be described with primitive rhombic axes. The length a of the primitive cell below equals \frac \sqrt of the conventional cell above. Crystal class ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ferroelectric Materials
In physics and materials science, ferroelectricity is a characteristic of certain materials that have a spontaneous electric polarization that can be reversed by the application of an external electric field. All ferroelectrics are also piezoelectric and pyroelectric, with the additional property that their natural electrical polarization is reversible. The term is used in analogy to ferromagnetism, in which a material exhibits a permanent magnetic moment. Ferromagnetism was already known when ferroelectricity was discovered in 1920 in Rochelle salt by American physicist Joseph Valasek.See and Thus, the prefix ''ferro'', meaning iron, was used to describe the property despite the fact that most ferroelectric materials do not contain iron. Materials that are both ferroelectric ''and'' ferromagnetic are known as multiferroics. Polarization When most materials are electrically polarized, the polarization induced, ''P'', is almost exactly proportional to the applied exte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
