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Harz Granite
Harz granite (german: Harzer Granit, ) is found in the Harz Mountains of central Germany. It may be divided into five types, all of which were widely used as natural stone: Knaupsholz granite, Birkenkopf granite, Wurmberg granite, Königskopf granite and Ilsestein granite. The first three granites were widely used in North Germany, Belgium and the Netherlands and, later, also in East Germany. Knaupsholz granite was ''"for a long time one of the most important types of cut stone in the former GDR"''. In 2009 only Knaupsholz granite was still being quarried. Geology The granitic plutons of the Harz Mountains - the Brocken, Ramberg and Oker plutons - were formed at the end of the Harz mountain building period (the Hercynian orogeny) during the Late Carboniferous about 300 million years ago. These natural stones were formed when large magma intrusions in the Brocken granite massif solidified at different cooling and crystallization rates into several differently coloured granites. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Birkenkopf
The Birkenkopf () is a prominent hill in Stuttgart, Germany. At an elevation of 511m, is almost 260m higher than city centre. It is in part a Schuttberg, an artificial hill built from the ruins and rubble from World War II. During the war, 53 Allied bombing missions destroyed over 45% of Stuttgart, and nearly the entire city center. Between 1953 and 1957, 1.5 million cubic meters of rubble were cleared and moved to the hill, which resulted in an increase in height of around 40 meters. At the summit there are many recognizable facades from ruined buildings. The locals colloquially call the Birkenkopf "Monte Scherbelino", which roughly translates as "Mount Shards" but in an expression alluding to Italian. One of the pieces of rubble has a plaque attached to it, which says: ''Dieser Berg nach dem Zweiten Weltkrieg aufgetürmt aus den Trümmern der Stadt steht den Opfern zum Gedächtnis den Lebenden zur Mahnung.'' This translates roughly as: ''This mountain, after World War II pile ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lower Saxony
Lower Saxony (german: Niedersachsen ; nds, Neddersassen; stq, Läichsaksen) is a German state (') in northwestern Germany. It is the second-largest state by land area, with , and fourth-largest in population (8 million in 2021) among the 16 ' federated as the Federal Republic of Germany. In rural areas, Northern Low Saxon and Saterland Frisian are still spoken, albeit in declining numbers. Lower Saxony borders on (from north and clockwise) the North Sea, the states of Schleswig-Holstein, Hamburg, , Brandenburg, Saxony-Anhalt, Thuringia, Hesse and North Rhine-Westphalia, and the Netherlands. Furthermore, the state of Bremen forms two enclaves within Lower Saxony, one being the city of Bremen, the other its seaport, Bremerhaven (which is a semi-enclave, as it has a coastline). Lower Saxony thus borders more neighbours than any other single '. The state's largest cities are state capital Hanover, Braunschweig (Brunswick), Lüneburg, Osnabrück, Oldenburg, Hildesheim, Salzgitt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyrite
The mineral pyrite (), or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula Iron, FeSulfur, S2 (iron (II) disulfide). Pyrite is the most abundant sulfide mineral. Pyrite's metallic Luster (mineralogy), luster and pale brass-yellow hue give it a superficial resemblance to gold, hence the well-known nickname of ''fool's gold''. The color has also led to the nicknames ''brass'', ''brazzle'', and ''Brazil'', primarily used to refer to pyrite found in coal. The name ''pyrite'' is derived from the Greek language, Greek (), 'stone or mineral which strikes fire', in turn from (), 'fire'. In ancient Roman times, this name was applied to several types of stone that would create sparks when struck against steel; Pliny the Elder described one of them as being brassy, almost certainly a reference to what we now call pyrite. By Georgius Agricola's time, , the term had become a generic term for all of the pyrite group, sulfide minerals. Pyrite is usua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnetite
Magnetite is a mineral and one of the main iron ores, with the chemical formula Fe2+Fe3+2O4. It is one of the oxides of iron, and is ferrimagnetic; it is attracted to a magnet and can be magnetized to become a permanent magnet itself. With the exception of extremely rare native iron deposits, it is the most magnetic of all the naturally occurring minerals on Earth. Naturally magnetized pieces of magnetite, called lodestone, will attract small pieces of iron, which is how ancient peoples first discovered the property of magnetism. Magnetite is black or brownish-black with a metallic luster, has a Mohs hardness of 5–6 and leaves a black streak. Small grains of magnetite are very common in igneous and metamorphic rocks. The chemical IUPAC name is iron(II,III) oxide and the common chemical name is ''ferrous-ferric oxide''. Properties In addition to igneous rocks, magnetite also occurs in sedimentary rocks, including banded iron formations and in lake and marine sediments ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chlorite Group
The chlorites are the group of phyllosilicate minerals common in low-grade metamorphic rocks and in altered igneous rocks. Greenschist, formed by metamorphism of basalt or other low-silica volcanic rock, typically contains significant amounts of chlorite. Chlorite minerals show a wide variety of compositions, in which magnesium, iron, aluminium, and silicon substitute for each other in the crystal structure. A complete solid solution series exists between the two most common end members, magnesium-rich clinochlore and iron-rich chamosite. In addition, manganese, zinc, lithium, and calcium species are known. The great range in composition results in considerable variation in physical, optical, and X-ray properties. Similarly, the range of chemical composition allows chlorite group minerals to exist over a wide range of temperature and pressure conditions. For this reason chlorite minerals are ubiquitous minerals within low and medium temperature metamorphic rocks, some igneous r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biotite
Biotite is a common group of phyllosilicate minerals within the mica group, with the approximate chemical formula . It is primarily a solid-solution series between the iron-endmember annite, and the magnesium-endmember phlogopite; more aluminous end-members include siderophyllite and eastonite. Biotite was regarded as a mineral ''species'' by the International Mineralogical Association until 1998, when its status was changed to a mineral ''group''. The term ''biotite'' is still used to describe unanalysed dark micas in the field. Biotite was named by J.F.L. Hausmann in 1847 in honor of the French physicist Jean-Baptiste Biot, who performed early research into the many optical properties of mica. Members of the biotite group are sheet silicates. Iron, magnesium, aluminium, silicon, oxygen, and hydrogen form sheets that are weakly bound together by potassium ions. The term "iron mica" is sometimes used for iron-rich biotite, but the term also refers to a flaky micaceous form ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plagioclase Feldspar
Plagioclase is a series of tectosilicate (framework silicate) minerals within the feldspar group. Rather than referring to a particular mineral with a specific chemical composition, plagioclase is a continuous solid solution series, more properly known as the plagioclase feldspar series. This was first shown by the German mineralogist Johann Friedrich Christian Hessel (1796–1872) in 1826. The series ranges from albite to anorthite endmembers (with respective compositions NaAlSi3O8 to CaAl2Si2O8), where sodium and calcium atoms can substitute for each other in the mineral's crystal lattice structure. Plagioclase in hand samples is often identified by its polysynthetic crystal twinning or 'record-groove' effect. Plagioclase is a major constituent mineral in the Earth's crust, and is consequently an important diagnostic tool in petrology for identifying the composition, origin and evolution of igneous rocks. Plagioclase is also a major constituent of rock in the highlands ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alkali Feldspar
Feldspars are a group of rock-forming aluminium tectosilicate minerals, also containing other cations such as sodium, calcium, potassium, or barium. The most common members of the feldspar group are the ''plagioclase'' (sodium-calcium) feldspars and the ''alkali'' (potassium-sodium) feldspars. Feldspars make up about 60% of the Earth's crust, and 41% of the Earth's continental crust by weight. Feldspars crystalize from magma as both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock. Rock formed almost entirely of calcic plagioclase feldspar is known as anorthosite. Feldspars are also found in many types of sedimentary rocks. Compositions The feldspar group of minerals consists of tectosilicates, silicate minerals in which silicon ions are linked by shared oxygen ions to form a three-dimensional network. Compositions of major elements in common feldspars can be expressed in terms of three endmembers: * potassium feldspar (K-spar) en ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quartz
Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation from α-quartz to β-quartz takes place abruptly at . Since the transformation is accompanied by a significant change in volume, it can easily induce microfracturing of ceramics or rocks passing through this temperature threshold. There are many different varieties of quartz, several of which are classified as gemstones. Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Eurasia. Quartz is the mineral defining the val ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saxony-Anhalt
Saxony-Anhalt (german: Sachsen-Anhalt ; nds, Sassen-Anholt) is a state of Germany, bordering the states of Brandenburg, Saxony, Thuringia and Lower Saxony. It covers an area of and has a population of 2.18 million inhabitants, making it the 8th-largest state in Germany by area and the 11th-largest by population. Its capital is Magdeburg and its largest city is Halle (Saale). The state of Saxony-Anhalt was formed in July 1945 after World War II, when the Soviet army administration in Allied-occupied Germany formed it from the former Prussian Province of Saxony and the Free State of Anhalt. Saxony-Anhalt became part of the German Democratic Republic in 1949, but was dissolved in 1952 during administrative reforms and its territory divided into the districts of Halle and Magdeburg. Following German reunification the state of Saxony-Anhalt was re-established in 1990 and became one of the new states of the Federal Republic of Germany. Saxony-Anhalt is renowned for its ri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schierke Station
Schierke station (german: Bahnhof Schierke) is the railway station in the village of Schierke operated by the Harz Narrow Gauge Railways on the Brocken Railway in the Harz Mountains of central Germany. Schierke itself lies as the foot of the highest mountain in the Harz, the Brocken, and is located in the borough of Wernigerode in the federal state of Saxony-Anhalt. History The station, which is located at a height of 687 metres above sea level, was opened on 20 June 1898 and has been in continuous use as a railway station ever since. On the completion of the line up to the Brocken on 4 October 1898, trains to the highest mountain in North Germany, which were predominantly used by tourists, called at Schierke station. Because Brocken station was not served in winter due to heavy snowfalls, trains always terminated in Schierke from 16 October to 29 April. Not until the German Winter Sports Championships in spring 1950 did trains run to the Brocken in winter as well. As a result ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schierke
Schierke is a village and a former municipality in the Harz district, in the German state of Saxony-Anhalt. Since 1 July 2009, it is part of the town Wernigerode. Situated within the Harz mountain range in the valley of the river Bode, at the rim of the Harz National Park, it is mainly a tourist resort, especially for hiking and all kinds of winter sports. Geography Location The winter sport and climatic spa of Schierke lies in the High Harz mountains, southeast of their highest summit, the Brocken. It is situated in the Harz/Saxony-Anhalt Nature Park and borders on the Harz National Park in the north. Situated 600 to 650 m above sea level in the valley of the Cold Bode, the parish of Schierke has an area of 40.1 km² and a population of 713 (as at 31 December 2007). Today Schierke again is a popular place to start or finish a walk to the Brocken massif via the '' Goetheweg'' or the ''Glashüttenweg''. It has bus service and access to the Brocken Railway, whose s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
