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Karl Friedrich August Rammelsberg
Karl Friedrich August Rammelsberg (1 April 1813 – 28 December 1899) was a German mineralogist from Berlin, Prussia. Life After an apprenticeship in pharmacy, he studied chemistry and crystallography at the University of Berlin, where his influences were Eilhard Mitscherlich, Heinrich Rose, Christian Samuel Weiss and Gustav Rose. His graduate thesis in 1837 dealt with cyanogen, "''De cyanogenii connubiis nonnullis''". In 1841 he became a privatdozent at the university, and in 1845 was named an associate professor of inorganic chemistry. From 1850 he taught classes at the ''Gewerbeakademie'', a vocational training academy that was a predecessor of the Technical University of Berlin. In 1874 he became a full professor of chemistry at the university and in 1883 was appointed director of the inorganic chemistry laboratory.Rammelsbe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kingdom Of Prussia
The Kingdom of Prussia (german: Königreich Preußen, ) was a German kingdom that constituted the state of Prussia between 1701 and 1918.Marriott, J. A. R., and Charles Grant Robertson. ''The Evolution of Prussia, the Making of an Empire''. Rev. ed. Oxford: Clarendon Press, 1946. It was the driving force behind the unification of Germany in 1871 and was the leading state of the German Empire until its dissolution in 1918. Although it took its name from the region called Prussia, it was based in the Margraviate of Brandenburg. Its capital was Berlin. The kings of Prussia were from the House of Hohenzollern. Brandenburg-Prussia, predecessor of the kingdom, became a military power under Frederick William, Elector of Brandenburg, known as "The Great Elector". As a kingdom, Prussia continued its rise to power, especially during the reign of Frederick II, more commonly known as Frederick the Great, who was the third son of Frederick William I.Horn, D. B. "The Youth of Frederick ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Walther Killy
Walther Killy (26 August 191728 December 1995) was a German literary scholar who specialised in poetry, especially that of Friedrich Hölderlin and Georg Trakl. He taught at the Free University of Berlin, the Georg-August-Universität Göttingen, as founding rector of the University of Bremen, as visiting scholar at the University of California and Harvard University, and at the University of Bern. He became known as editor of literary encyclopedias, the ''Killy Literaturlexikon'' and the ''Deutsche Biographische Enzyklopädie''. Life Killy was born in Bonn, the son of the lawyer . He studied German, and wrote his doctoral thesis ''Die Überlieferung der Gedichte Hölderlins'', about the tradition of poems by Friedrich Hölderlin, with Julius Petersen in 1940. Killy and his father encouraged Petersen and in Weimar to produce a historical-critical edition of Hölderlin's works, planned to appear in time for the Hölderlin anniversary year 1943. Since Hölderlin was held in hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1813 Births
Events January–March * January 18–January 23 – War of 1812: The Battle of Frenchtown is fought in modern-day Monroe, Michigan between the United States and a British and Native American alliance. * January 24 – The Philharmonic Society (later the Royal Philharmonic Society) is founded in London. * January 28 – Jane Austen's '' Pride and Prejudice'' is published anonymously in London. * January 31 – The Assembly of the Year XIII is inaugurated in Buenos Aires. * February – War of 1812 in North America: General William Henry Harrison sends out an expedition to burn the British vessels at Fort Malden by going across Lake Erie via the Bass Islands in sleighs, but the ice is not hard enough, and the expedition returns. * February 3 – Argentine War of Independence: José de San Martín and his Regiment of Mounted Grenadiers gain a largely symbolic victory against a Spanish royalist army in the Battle of San Lorenzo. * February ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lichterfelde (Berlin)
Lichterfelde () is a locality in the borough of Steglitz-Zehlendorf in Berlin, Germany. Until 2001 it was part of the former borough of Steglitz, along with Steglitz and Lankwitz. Lichterfelde is home to institutions like the Berlin Botanical Garden and Museum, the German Federal Intelligence Service (BND), the German Federal Archives and the Charité university hospital's ''Benjamin Franklin Campus''. Many embassies and landmark-protected buildings are located in the affluent mansion settlement in Lichterfelde West. History The Prussian village ' was founded in the 13th century by Flemish settlers. It witnessed considerable growth in the 19th century when the two "villa colonies" of and were founded: two elegant settlements for wealthy Berliners consisting completely of villas or mansions. The settlements and the historical villages of ' and ' were united in 1880 under the name ' (Greater Lichterfelde). Lichterfelde was chosen as the seat of the Prussian Main Military acad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nickel Arsenide
Nickeline or niccolite is a mineral consisting primarily of nickel arsenide (NiAs). The naturally-occurring mineral contains roughly 43.9% nickel and 56.1% arsenic by mass, but composition of the mineral may vary slightly. Small quantities of sulfur, iron and cobalt are usually present, and sometimes the arsenic is largely replaced by antimony. This last forms an isomorphous series with breithauptite (nickel antimonide). Etymology and history Medieval miners looking for copper in the German Erzgebirge ("Ore Mountains") would sometimes find a red mineral, superficially resembling copper ore. Upon attempting extraction, no copper was produced, and subsequently, the miners would be afflicted with mysterious illness. They blamed a mischievous sprite of German mythology, Nickel (similar to ''Old Nick'') for besetting the copper (German: Kupfer). This German equivalent of "copper-nickel" was used as early as 1694 (other old German synonyms are ''Rotnickelkies'' and ''Arsennickel' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rammelsbergite
Rammelsbergite is a nickel arsenide mineral with formula NiAs2. It forms metallic silvery to tin white to reddish orthorhombic prismatic crystals, and is usually massive in form. It has a Mohs hardness of 5.5 and a specific gravity of 7.1. It was first described in 1854 from its type locality in the Schneeberg District in Saxony, Germany. It was named after the German chemist and mineralogist, Karl Friedrich August Rammelsberg (1813–1899). It occurs as a hydrothermal mineral in medium temperature veins association with skutterudite, safflorite, lollingite, nickeline, native bismuth, native silver, algodonite, domeykite and uraninite. See also * List of minerals named after people This is a list of minerals named after people. The chemical composition follows name. A *Abelsonite: C31H32N4Ni – American physicist Philip Hauge Abelson (1913–2004)alfred *Abswurmbachite: Cu2+Mn3+6O8SiO4 – German mineralogist I ... References Mineral Galleries* Nickel miner ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tachyhydrite
Tachyhydrite is an unstable mineral, a hydrous chloride of calcium and magnesium with formula: Ca Mg2 Cl6·12 H2O. It is a rare component of marine evaporite salt deposits. Upon exposure to moist air it rapidly deliquesces and dissolves. It forms a colorless to yellow trigonal crystal with a vitreous luster. It is soft with a Mohs hardness of 2 and has a low specific gravity of 1.66. It has good cleavage in three directions and typically occurs in crystalline masses. It was first described in 1856 for an occurrence in Stassfurt, Saxony, Germany. Its name is from the Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ... for ''quick water'', in reference to its ready deliquescence. According to a patent filed years ago by a Halliburton researcher, high strength hydrochloric a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnesioferrite
Magnesioferrite is a magnesium iron oxide mineral, a member of the magnetite series of spinels. Magnesioferrite crystallizes as black metallic octahedral crystals. It is named after its chemical composition of magnesium and ferric iron. The density is 4.6 - 4.7 (average = 4.65), and the diaphaniety is opaque. Occurs as well-formed fine sized crystals or massive and granular. Its hardness is 6-6.5. It has a metallic luster and a dark red streak. Occurrence It occurs in fumaroles, as a result of combustion metamorphism and coal seam fires, in glass spherules related to meteorite impacts, and as accessory phase in kimberlites and carbonatites. It has been reported from Vesuvius and Stromboli, Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical re .... References Iron(III) mine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isomorphism (crystallography)
In chemistry isomorphism has meanings both at the level of crystallography and at a molecular level. In crystallography, compounds are isomorphous if their symmetry is the same and their unit cell parameters are similar Molecules are isomorphous if they have similar shapes. The coordination complexes tris(acetylacetonato)iron (Fe(acac)3) and tris(acetylacetonato)aluminium (Al(acac)3) are isomorphous. These compounds, both of ''D''3 symmetry have very similar shapes, as determined by bond lengths and bond angles. Isomorphous compounds give rise to isomorphous crystals and form solid solutions. Historically, crystal shape was defined by measuring the angles between crystal faces with a goniometer. Whereas crystals of Fe(acac)3 are deep red and crystals of Al(acac)3 are colorless, a solid solution of the two, i.e. Fe1−xAlx(acac)3 will be deep or pale pink depending on the Fe/Al ratio, x. Double sulfates, such as Tutton's salt, with the generic formula MI2MII(SO4)2.6H2O, wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schlippe's Salt
Sodium thioantimoniate or sodium tetrathioantimonate(V) is an inorganic compound with the formula . The nonahydrate of this chemical, , is known as Schlippe's salt, named after Johann Karl Friedrich von Schlippe (1799–1867), These compounds are examples of sulfosalts. They were once of interest as species generated in qualitative inorganic analysis. Structure left, Anhydrous NaSbS3 has a complicated structure featuring SbS4- tetrahedra interconnected by Na-S bonds. Color scheme: red = Sb, yellow = S, violet = Na. The nonahydrate consists of the tetrahedral tetrathioantimonate(V) anions and sodium cations , which are hydrated. The Sb-S distance is 2.33 Å. Related salts are known for different cations including ammonium and potassium. The anhydrous salt is a polymer with tetrahedral Na and Sb sites. Preparation Sodium tetrathioantimonate nonahydrate is prepared by the reaction of "antimony trisulfide", elemental sulfur, and aqueous sulfide source. : The Na2S can be generated ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phosphoric Acids
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Phosphoric may refer to: *Phosphoric acid *Phosphoric anhydride, see phosphorus pentoxide See also *Phosphorus Phosphorus is a chemical element with the symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Ear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hypophosphoric Acid
Hypophosphoric acid is a mineral acid with the formula H4P2O6, with phosphorus in a formal oxidation state of +4. In the solid state it is present as the dihydrate, H4P2O6·2H2O. In hypophosphoric acid the phosphorus atoms are identical and joined directly with a P−P bond. Isohypophosphoric acid is a structural isomer of hypophosphoric acid in which one phosphorus has a hydrogen directedly bonded to it and that phosphorus atom is linked to the other one by an oxygen bridge to give a phosphorous acid/phosphoric acid mixed anhydride. The two phosphorus atoms are in the +3 and +5 oxidation states, respectively. Preparation and reactions Hypophosphoric acid can be prepared by the reaction of red phosphorus with sodium chlorite at room temperature.Phosphorus: Chemistry, Biochemistry and Technology, Sixth Edition, 2013, D.E.C. Corbridge, CRC Pres, Taylor Francis Group, :2 P + 2 NaClO2 + 2 H2O → Na2H2P2O6 + 2 HCl A mixture of hypophosphoric acid, phosphorous acid (H3PO3) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
