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Fruchtschiefer
Fruchtschiefer is a local variety of contact metamorphic rock that is derived from argillite. Formation and mineral content Fruchtschiefer is formed under very low pressure (low grade metamorphic rock) and temperatures of ca. 500 °C. At these temperatures cordierite grows to the size of grains of corn, which is where its name comes from; ''Frucht'' being German for "corn" (as well as "fruit"). It contains the following minerals: cordierite, muscovite, potassium feldspar, quartz, biotite and hornblende. Occurrence Fruchtschiefer occurs in Germany as contact metamorphic rock in the Harz, Ore Mountains, Odenwald and Vogtland. The best known deposits are those near Theuma and Tirpersdorf. Their protoliths originate from the Ordovician period. Rocks quarried here have been used well beyond the local region.Heiner Siedel, Ferdinand Heinz: ''Der Abbau von Fruchtschiefer im Gebiet um Theuma und Tirpersdorf im sächsischen Vogtland und seine Verwendung''. in: Veröffentlichun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fruchtschiefer Theuma
Fruchtschiefer is a local variety of contact metamorphic rock that is derived from argillite. Formation and mineral content Fruchtschiefer is formed under very low pressure (low grade metamorphic rock) and temperatures of ca. 500 °C. At these temperatures cordierite grows to the size of grains of corn, which is where its name comes from; ''Frucht'' being German for "corn" (as well as "fruit"). It contains the following minerals: cordierite, muscovite, potassium feldspar, quartz, biotite and hornblende. Occurrence Fruchtschiefer occurs in Germany as contact metamorphic rock in the Harz, Ore Mountains, Odenwald and Vogtland. The best known deposits are those near Theuma and Tirpersdorf. Their protoliths originate from the Ordovician period. Rocks quarried here have been used well beyond the local region.Heiner Siedel, Ferdinand Heinz: ''Der Abbau von Fruchtschiefer im Gebiet um Theuma und Tirpersdorf im sächsischen Vogtland und seine Verwendung''. in: Veröffentlichun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Odenwald
The Odenwald () is a low mountain range in the German states of Hesse, Bavaria and Baden-Württemberg. Location The Odenwald is located between the Upper Rhine Plain with the Bergstraße and the ''Hessisches Ried'' (the northeastern section of the Rhine rift) to the west, the Main and the Bauland (a mostly unwooded area with good soils) to the east, the Hanau-Seligenstadt Basin – a subbasin of the Upper Rhine Rift Valley in the Rhine-Main Lowlands – to the north and the Kraichgau to the south. The part south of the Neckar valley is sometimes called the ''Kleiner Odenwald'' ("Little Odenwald"). The northern and western Odenwald belong to southern Hesse, with the south stretching into Baden. In the northeast, a small part lies in Lower Franconia in Bavaria. Geology The Odenwald, along with other parts of the Central German Uplands, belongs to the Variscan, which more than 300 million years ago in the Carboniferous period ran through great parts of Europe. The cause ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Georg Dehio
Georg Gottfried Julius Dehio (22 November 1850 in Reval (now Tallinn), Governorate of Estonia, Russian Empire – 21 March 1932 in Tübingen), was a Baltic German art historian. In 1900, Dehio started the "''Handbuch der deutschen Kunstgeschichte''" (Handbook of German Art History), published by Ernst Wasmuth. The project is ongoing and managed by the 'Dehio-Vereinigung', Munich. He is the namesake of the Georg Dehio Prize (Georg Dehio Book Prize). He was laureate of the Pour le Mérite order ( "Pour le Mérite für Wissenschaften und Künste"), the Eagle Shield of the German Empire (Adlerschild des Deutschen Reiches) and the Bavarian Maximilian Order for Science and Art. He held honorary doctor titles in Göttingen, Tübingen, Frankfurt (Main) and Darmstadt. The minor planet 48415 Dehio discovered circa 1987, is named after him. See also * Karl Gottfried Konstantin Dehio (27 May 1851, Reval (Tallinn) – 26 February 1927, Dorpat (Tartu)), internist, cousin * Ludwi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plauen
Plauen (; Czech language, Czech: ''Plavno'') is, with around 65,000 inhabitants, the fifth-largest city of Saxony, Germany after Leipzig, Dresden, Chemnitz and Zwickau, the second-largest city of the Vogtland after Gera, as well as the largest city in the Saxon Vogtland (German: ''Sächsisches Vogtland''). The city lies on the river White Elster (''Weiße Elster''; a tributary of the Saale), in the Central Vogtlandian Hill Country. Plauen is the southwesternmost city of a string of cities sitting in the densely populated foreland of the Elster Mountains, Elster and Ore Mountains, stretching from Plauen in the southwest via Zwickau, Chemnitz and Freiberg to Dresden in the northeast. It is the capital of the Vogtland District. Plauen borders Thuringia to the north, and it is also situated near the Saxon border with Bavaria (Franconia) and the Czech Republic (Bohemia). Although being a Saxon city, the regional Vogtlandian dialect spoken in Plauen is a (Upper Saxon, Saxon-influenc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Middle Ages
In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire and transitioned into the Renaissance and the Age of Discovery. The Middle Ages is the middle period of the three traditional divisions of Western history: classical antiquity, the medieval period, and the modern period. The medieval period is itself subdivided into the Early, High, and Late Middle Ages. Population decline, counterurbanisation, the collapse of centralized authority, invasions, and mass migrations of tribes, which had begun in late antiquity, continued into the Early Middle Ages. The large-scale movements of the Migration Period, including various Germanic peoples, formed new kingdoms in what remained of the Western Roman Empire. In the 7th century, North Africa and the Middle East—most recently part of the Eastern Ro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Galvanization
Galvanization or galvanizing (American and British English spelling differences, also spelled galvanisation or galvanising) is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, hot-dip galvanizing, in which the parts are submerged in a bath of hot, molten zinc. Protective action The zinc coating, when intact, prevents corrosive substances from reaching the underlying iron. Additional electroplating such as a chromate conversion coating may be applied to provide further Passivation (chemistry)#Surface passivation, surface passivation to the substrate material. History and etymology The earliest known example of galvanized iron was encountered by Europeans on 17th-century Indian armour in the Royal Armouries Museum collection. The term "galvanized" continues to be used metaphorically of any stimulus which results in activity by a person or group of people. In modern usage, the term "galva ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordovician
The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. The Ordovician, named after the Celtic Britons, Welsh tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were placing the same Rock (geology), rock beds in North Wales in the Cambrian and Silurian systems, respectively. Lapworth recognized that the fossil fauna in the disputed Stratum, strata were different from those of either the Cambrian or the Silurian systems, and placed them in a system of their own. The Ordovician received international approval in 1960 (forty years after Lapworth's death), when it was adopted as an official period of the Paleozoic Era by the International Union of Geological Sciences, Intern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protolith
A protolith () is the original, unmetamorphosed rock from which a given metamorphic rock is formed. For example, the protolith of a slate is a shale or mudstone. Metamorphic rocks can be derived from any other kind of non-metamorphic rock and thus there is a wide variety of protoliths. Identifying a protolith is a major aim of metamorphic geology. Protoliths are non-metamorphic rocks and have no protoliths themselves. The non-metamorphic rocks fall into two classes: sedimentary rocks, formed from sediment, and igneous rocks, formed from magma. The source of the sediment of a sedimentary rock is termed its provenance. Magmatic protoliths can be further divided into three categories: ultramafic rock, mafic rock, and quartzo-feldspathic rock. Similarly, sedimentary protoliths can be classified as quartzo-feldspathic, pelitic, carbonate rocks, or some mixture of the three. On a geological time scale, the first protoliths were first formed shortly after the formation of the Earth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tirpersdorf
Tirpersdorf is a municipality in the Vogtlandkreis The Vogtlandkreis () is a ''Landkreis'' (rural district) in the southwest of Saxony, Germany, at the borders to Thuringia, Bavaria, and the Czech Republic. Neighboring districts are (from south clockwise) Hof, Saale-Orla, Greiz, Zwickau and Erz ... district, in Saxony, Germany. References Municipalities in Saxony Vogtlandkreis {{Vogtlandkreis-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theuma
Theuma is a municipality in the Vogtlandkreis The Vogtlandkreis () is a ''Landkreis'' (rural district) in the southwest of Saxony, Germany, at the borders to Thuringia, Bavaria, and the Czech Republic. Neighboring districts are (from south clockwise) Hof, Saale-Orla, Greiz, Zwickau and Erzg ... district, in Saxony, Germany. References Municipalities in Saxony Vogtlandkreis {{Vogtlandkreis-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vogtland
Vogtland (; cz, Fojtsko) is a region spanning the German states of Bavaria, Saxony and Thuringia and north-western Bohemia in the Czech Republic. It overlaps with and is largely contained within Euregio Egrensis. The name alludes to the former leadership by the Vögte ("advocates" or "lords protector") of Weida, Gera and Plauen. Geography Natural geography The landscape of the Vogtland is sometimes referred to as idyllic, bearing in mind its fields, meadows and wooded hilltops. In the south and southeast, Vogtland rises to a low or mid-height mountain range also called ''Oberes Vogtland'', or Upper Vogtland. Here, monocultural coniferous forest is the predominant form of vegetation. The Vogtland's highest mountain is Schneehübel, reaching 974 metres; another remarkable landmark is the Schneckenstein, 883 m above sea level, which gained some renown for its (falsely) alleged unique abundance of topaz crystals. Its mountains spread from Ore Mountains in the so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
