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Selenite Minerals
Selenite may refer to: Substances containing selenium *A selenium-containing anion or ionic compound with the SeO32− anion: **Selenite (ion), anion is a selenium oxoanion with the chemical formula SeO32− ***Selenous acid, the conjugate acid, with the formula H2SeO3 ***Salts of this anion: ****Silver selenite, an inorganic compound of formula Ag2SeO3 ****Sodium selenite, a salt, a colourless solid, and the most common water-soluble selenium compound *Selenite broth, an enrichment medium for the isolation of ''Salmonella'' species Other *Selenite (mineral), a variety of gypsum (CaSO4·2H2O) * ''Selenites'' is a synonym of ''Zophos'', a genus of land snails in the family Haplotrematidae * Selenite Range, a mountain range in Pershing County, Nevada ** Selenite Peak, a summit in the Selenite Range, Nevada * Selenite, a high class citizen that experienced space travel, from the videogame ''Event_0'' * Selenite, a fictional native inhabitant of the Moon; see Moon in science fic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Selenium
Selenium is a chemical element with the symbol Se and atomic number 34. It is a nonmetal (more rarely considered a metalloid) with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. It seldom occurs in its elemental state or as pure ore compounds in the Earth's crust. Selenium – from Greek ( 'Moon') – was discovered in 1817 by , who noted the similarity of the new element to the previously discovered tellurium (named for the Earth). Selenium is found in metal sulfide ores, where it partially replaces the sulfur. Commercially, selenium is produced as a byproduct in the refining of these ores, most often during production. Minerals that are pure selenide or selenate compounds are known but rare. The chief commercial uses for selenium today are glassmaking and pigments. Selenium is a semiconductor and is used in photocells. Applications in electronics, once important, have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Selenite (ion)
Selenite refers to the anion with the chemical formula . It is the oxyanion of selenium. It is the selenium analog of the sulfite ion, . Thus selenite is pyramidal and selenium is assigned oxidation state +4. Selenite also refers to compounds that contains this ion, for example sodium selenite which is a common source of selenite. Selenite also refers to the esters of selenous acid, for example dimethyl selenite Ethane ( , ) is an organic chemical compound with chemical formula . At standard temperature and pressure, ethane is a colorless, odorless gas. Like many hydrocarbons, ethane is isolated on an industrial scale from natural gas and as a petr ... . Synthesis and reactions Selenite salts can be prepared by neutralizing solutions of selenous acid, which is generated by dissolving selenium dioxide in water. The process proceeds via the hydrogenselenite ion, . Selenite reacts with elemental sulfur to form thioselenate: : Most selenite salts can be formed by heatin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Selenous Acid
Selenous acid (or selenious acid) is the chemical compound with the formula . Structurally, it is more accurately described by . It is the principal oxoacid of selenium; the other being selenic acid. Formation and properties Selenous acid is analogous to sulfurous acid, but it is more readily isolated. Selenous acid is easily formed upon the addition of selenium dioxide to water. As a crystalline solid, the compound can be seen as pyramidal molecules that are interconnected with hydrogen bonds. In solution it is a diprotic acid: : (p''K''a = 2.62) : (p''K''a = 8.32) It is moderately oxidizing in nature, but kinetically slow. In 1 M : : (''E''o = +0.74 V) In 1 M : : (''E''o = −0.37 V) Selenous acid is hygroscopic. Uses The major use is in protecting and changing the color of steel, especially steel parts on firearms. The so-called cold-bluing process uses selenous acid, copper(II) nitrate, and nitric acid to change the color of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silver Selenite
Silver selenite is an inorganic compound of formula Ag2SeO3. Production Silver selenite is formed during the recovery of selenium from copper anode slimes when they are subjected to oxidative roasting, causing some silver selenide to be converted to the selenite. It can also be prepared by a precipitation reaction between silver nitrate and sodium selenite Sodium selenite is the inorganic compound with the formula Na2SeO3. This salt is a colourless solid. The pentahydrate Na2SeO3(H2O)5 is the most common water-soluble selenium compound. Synthesis and fundamental reactions Sodium selenite usually i ...: Another method is the reaction between selenium and silver nitrate: :3 Se + 6 AgNO3 + 3 H2O → 2 Ag2Se + Ag2SeO3 + 6 HNO3 References External links External MSDS Selenites Silver compounds {{inorganic-compound-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sodium Selenite
Sodium selenite is the inorganic compound with the formula Na2SeO3. This salt is a colourless solid. The pentahydrate Na2SeO3(H2O)5 is the most common water-soluble selenium compound. Synthesis and fundamental reactions Sodium selenite usually is prepared by the reaction of selenium dioxide with sodium hydroxide: :SeO2 + 2 NaOH → Na2SeO3 + H2O The hydrate converts to the anhydrous salt upon heating to 40 °C. According to X-ray crystallography, both anhydrous Na2SeO3 and its pentahydrate feature pyramidal SeO32−. The Se-O distances range from 1.67 to 1.72 Å. Oxidation of this anion gives sodium selenate, Na2SeO4. Applications Together with the related barium and zinc selenites, sodium selenite is mainly used in the manufacture of colorless glass. The pink color imparted by these selenites cancels out the green color imparted by iron impurities. Because selenium is an essential element, sodium selenite is an ingredient in dietary supplements such as multi- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Selenite Broth
Selenite broth is used as a selective medium for the isolation of '' Salmonella'' species. Selenite broth was originated by Leifson, while observing good recovery of Salmonella spp. and reduced growth of fecal coliforms. Selenite broth is used as a selective enrichment for the cultivation of Salmonella spp. that may be present in small numbers and competing with intestinal flora. This medium must not be autoclaved. Once prepared, it is steamed at 100°C for 30 minutes. There should be a very slight red precipitate. To minimize the risk of teratogenicity to workers, sodium selenite Sodium selenite is the inorganic compound with the formula Na2SeO3. This salt is a colourless solid. The pentahydrate Na2SeO3(H2O)5 is the most common water-soluble selenium compound. Synthesis and fundamental reactions Sodium selenite usually i ... must be added separately to the medium. It has a pH of approximately 7.1. Selenite broth gives pale or colorless colonies. Selenite broth contains: R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Selenite (mineral)
Selenite, satin spar, desert rose, gypsum flower are crystal habit varieties of the mineral gypsum. All varieties of gypsum, including selenite and alabaster, are composed of calcium sulfate dihydrate (meaning that it has two molecules of water), with the chemical formula CaSO4·2H2O. Selenite contains no significant selenium – The similar names both derive from Greek ( 'Moon') Some of the largest crystals ever found are of selenite, the largest specimen found in the Naica Mine's Cave of the Crystals being 12 metres long and weighing 55 tons. History and etymology "Selenite" is mostly synonymous with gypsum, but from the 15th century, it has named the transparent variety that occurs in crystals or crystalline masses. The name derives through Middle English from Latin , ultimately from Greek (, ). It got this name because people historically believed the mineral waxed and waned with the cycles of the Moon. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zophos
''Zophos'' is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Haplotrematidae. Species Species within the genus ''Zophos'' include: * '' Zophos baudoni'' (Petit, 1853)Robinson D. G., Hovestadt A., Fields A. & Breure A. S. H. (July 2009). "The land Mollusca of Dominica (Lesser Antilles), with notes on some enigmatic or rare species". ''Zoologische Mededelingen ''Zoologische Mededelingen'' was a peer-reviewed open access scientific journal publishing papers and monographs on animal systematics. The publisher was the National Museum of Natural History Naturalis in the Netherlands. The first issue appear ...'' 83 http://www.zoologischemededelingen.nl/83/nr03/a13 * '' Zophos concolor'' Férussac References External links Haplotrematidae {{Haplotrematidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Selenite Range
The Selenite Range is a mountain range in western Pershing County, Nevada. The range is a north–south trending feature approximately long and wide. The Fox Range lies to the west across the San Emidio Desert valley and the south end of the Black Rock Desert playa. Gerlach and Empire are two communities on the foothills and just to the northwest of the range. These communities supported the gypsum Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula . It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard or sidewalk chalk, and drywal ... mines in the range during their active period. The large Empire gypsum quarry lies just west of Luxor Peak at 40° 30' N; 119° 18' W just northwest of Kumiva Peak.Empire, NV 7.5 minute quadrangle, USGS, 1990Kumiva Peak, NV 7.5 minute quadrangle, USGS, 1990 The range was named for deposits of selenite, a variety of gypsum. Named Pea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Selenite Peak
Selenite Peak is a summit located in Pershing County, Nevada, United States. Description Selenite Peak is the fifth-highest peak of the Selenite Range which is a subset of the Great Basin Ranges. This peak is set on land managed by the Bureau of Land Management, and is the highest point of the BLM's Selenite Mountains Wilderness Study Area. It is situated southeast of the town of Gerlach, and northeast of Empire. Topographic relief is significant as the summit rises above the valley floor in three miles. This landform's toponym has been officially adopted by the U.S. Board on Geographic Names. Climate Selenite Peak is set in the Black Rock Desert which has hot summers and cold winters. The desert is an example of a cold desert climate The desert climate or arid climate (in the Köppen climate classification ''BWh'' and ''BWk''), is a dry climate sub-type in which there is a severe excess of evaporation over precipitation. The typically bald, rocky, or sandy surfaces ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Event 0
''Event ' is a first-person science fiction adventure game developed and published by Ocelot Society. It was released on September 14, 2016 for both Microsoft Windows and macOS. The game follows an astronaut en route to Europa, who after their ship suffers a catastrophic failure takes refuge in a dilapidated leisure ship, with the only remaining entity on board being the ship's AI, Kaizen-85. Gameplay consists of exploring the ship, repairing it in hopes of escaping, and speaking with Kaizen-85, who is a functional AI that the player can have conversations with. The game received positive reviews upon release. Plot and gameplay ''Event ' is set in an alternate timeline where humanity achieved interplanetary space travel as early as the 1980s. The game takes place in this timeline's 2012, where the players character is selected by International Transport Spacelines (ITS) to be part of a mission to Jupiter's moon Europa, from Earth. En route, the ship suffers a catastrophic failu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moon In Science Fiction
The Moon has appeared in fiction as a setting since at least classical antiquity. Throughout most of literary history, a significant portion of works depicting lunar voyages has been satirical in nature. From the late 1800s onwards, science fiction has successively focused largely on the themes of life on the Moon, first Moon landings, and lunar colonization. Early depictions The Moon has been a setting in fiction since at least the works of the ancient Greek writers Antonius Diogenes and Lucian of Samosata; the former's ''Of the Wonderful Things Beyond Thule'' has been lost and the latter's ''True History'' from the second century CE is a satire of fanciful travellers' tales. It was not until Johannes Kepler's novel '' Somnium'' was posthumously released in 1634 that the subject of travelling to the Moon was given a serious treatment in fiction. Building on Kepler's thoughts, and similar speculations by Francis Bacon on flying to the Moon in his 1627 work '' Sylva sylvaru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
