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Siderogel
Siderogel is an amorphous mineral (a mineraloid) consisting of iron(III) oxide-hydroxide , the same chemical compound as limonite and goethite; or possibly an hydrate of the same •''n''.Sven Köhler (2004): ''Auswahl und Einsatz von eisenhaltigen Füllmaterialien für permeable reaktive Barrieren (PRB) zur In-situ-Grundwassersanierung am Beispiel eines Chromatschadenfalles'', page 39. Volume 222 of ''Veröffentlichungen des Instituts für Geotechnik'', ETH Zürich; 227 pages. Siderogel is described as blackish, brownish, or reddish-brown, often glassy and translucent. It may be a gossan, the result of weathering and oxidation of sulfide ores. The International Mineralogical Association does not officially recognize siderogel as a mineral species.IMA (2018):The New IMA List of Minerals, version of November 2018. Accessed on 2019-02-14. Occurrence Siderogel has been reported in a few locations in Europe and Asia, including a site near Gavà and Bruguers, Catalunya;Eugeni Ba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iron(III) Oxide-hydroxide
Iron(III) oxide-hydroxide or ferric oxyhydroxideA. L. Mackay (1960): "β-Ferric Oxyhydroxide". ''Mineralogical Magazine'' (''Journal of the Mineralogical Society''), volume 32, issue 250, pages 545-557. is the chemical compound of iron, oxygen, and hydrogen with formula . The compound is often encountered as one of its hydrates, ·''n'' ust The monohydrate · is often referred to as iron(III) hydroxide ,CAS , C.I. 77492 hydrated iron oxide, yellow iron oxide, or Pigment Yellow 42. Natural occurrences Minerals Anhydrous ferric hydroxide occurs in the nature as the exceedingly rare mineral bernalite, Fe(OH)3·''n''H2O (n=0.0-0.25). Iron oxyhydroxides, , are much more common and occur naturally as structurally different minerals (polymorphs) denoted by the Greek letters α, β, γ and δ. * Goethite, α-FeO(OH), has been used as an ochre pigment since prehistoric times. * Akaganeite is the β polymorph,A. L. Mackay (1962): "β-Ferric oxyhydroxide—akaganéite", ''Miner ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mineral
In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound 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 are 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Catalunya
Catalonia (; ca, Catalunya ; Aranese Occitan: ''Catalonha'' ; es, Cataluña ) is an autonomous community of Spain, designated as a ''nationality'' by its Statute of Autonomy. Most of the territory (except the Val d'Aran) lies on the northeast of the Iberian Peninsula, to the south of the Pyrenees mountain range. Catalonia is administratively divided into four provinces: Barcelona, Girona, Lleida, and Tarragona. The capital and largest city, Barcelona is the second-most populated municipality in Spain and the fifth-most populous urban area in the European Union. > > > ''Catalonia'' theoretically derived. During the Middle Ages, Byzantine chroniclers claimed that ''Catalania'' derives from the local medley of Goths with Alans, initially constituting a ''Goth-Alania''. Other theories suggest: *''Catalunya'' derives from the term "land of castles", having evolved from the term ''castlà'' or ''castlan'', the medieval term for a castellan (a ruler of a castle). This theo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
China
China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and borders fourteen countries by land, the most of any country in the world, tied with Russia. Covering an area of approximately , it is the world's third largest country by total land area. The country consists of 22 provinces, five autonomous regions, four municipalities, and two Special Administrative Regions (Hong Kong and Macau). The national capital is Beijing, and the most populous city and financial center is Shanghai. Modern Chinese trace their origins to a cradle of civilization in the fertile basin of the Yellow River in the North China Plain. The semi-legendary Xia dynasty in the 21st century BCE and the well-attested Shang and Zhou dynasties developed a bureaucratic political system to serve hereditary monarchies, or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gejiu
(, ; Hani: ''Goqjef''; formerly known as Kochiu) is a county-level city and the former capital of Honghe prefecture, Yunnan Province, China, and has 202,000 urban inhabitants (ranked 14th largest city in Yunnan). It is the site of the country's largest tin deposits and its main industry is mining. Location Gejiu is located on top of a mountain to the north of the Red River (pinyin ''Hong He'') valley, which flows from Yunnan, Dali prefecture to Vietnam. To the south-west in this valley is Nansha, which lies directly below the town of Yuanyang. To the north-west lies Jianshui, and to the north Jijie. Mengzi lies 12 miles to the East. Layout The town is located in a crater-like depression around a lake on top of a mountain. The main road enters the town from the north through a thin pass. To the east and west are steep cliffs. Those to the west are too steep to inhabit, however extensive new construction along the eastern side has created many new districts. Adminis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Germany
Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated between the Baltic and North seas to the north, and the Alps to the south; it covers an area of , with a population of almost 84 million within its 16 constituent states. Germany borders Denmark to the north, Poland and the Czech Republic to the east, Austria and Switzerland to the south, and France, Luxembourg, Belgium, and the Netherlands to the west. The nation's capital and most populous city is Berlin and its financial centre is Frankfurt; the largest urban area is the Ruhr. Various Germanic tribes have inhabited the northern parts of modern Germany since classical antiquity. A region named Germania was documented before AD 100. In 962, the Kingdom of Germany formed the bulk of the Holy Roman Empire. During the 16th ce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemer
Hemer is a town in the Märkischer Kreis district, in North Rhine-Westphalia, Germany. Geography Hemer is located at the north end of the Sauerland near the Ruhr river. The highest elevation, at 546 metres (1,791 ft), is in the ''Balver Wald'' in the south of the city. The lowest elevation, at 160 metres (525 ft), is at the ''Edelburg'' in the northeast. History Burial mounds show that around 1250 BC, Bronze Age shepherds and farmers lived in the area. Graves from the time of the Merovingian Franks around the year 650 were found near the present city centre. Hemer was first mentioned in 1072 by its old name ''Hademare'' in a document of bishop Anno II of Cologne, granting lands to the newly founded Benedictine Grafschaft Abbey, including St. Vitus's church and two farms, the later '' :de:Haus Hemer'' and the '' :de:Hedhof''. In 1124 the parish of St. Vitus was separated from the parish of Menden. Hemer remained an unimportant settlement without market rights, even ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Menden
Menden (, official name: ''Menden (Sauerland)''; Westphalian: ''Mennen'') is a city in the district Märkischer Kreis, in North Rhine-Westphalia, Germany. It is located at the north end of the Sauerland near the Ruhr river. History Menden's first churches were built in the 9th century. From 1180 on the area around Menden was part of the Cologne region, however, as it was on the border with the County of Mark, it was often fought over. In 1276, it received city rights. Industrialization started early: in 1695 needle production was the first industry, later followed by limestone products such as cement. In 1816 Menden was included within Prussia, after being part of Hesse for 13 years. In 1975 the city was merged with several previously independent municipalities, thus it grew in area as well as population. Points of interest The ''Hönnetal'', a narrow valley with some beautiful cliffs carved into the limestone bedrock by the river Hönne. Education Primary education In Me ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spanish Language
Spanish ( or , Castilian) is a Romance language of the Indo-European language family that evolved from colloquial Latin spoken on the Iberian peninsula. Today, it is a global language with more than 500 million native speakers, mainly in the Americas and Spain. Spanish is the official language of 20 countries. It is the world's second-most spoken native language after Mandarin Chinese; the world's fourth-most spoken language overall after English, Mandarin Chinese, and Hindustani (Hindi-Urdu); and the world's most widely spoken Romance language. The largest population of native speakers is in Mexico. Spanish is part of the Ibero-Romance group of languages, which evolved from several dialects of Vulgar Latin in Iberia after the collapse of the Western Roman Empire in the 5th century. The oldest Latin texts with traces of Spanish come from mid-northern Iberia in the 9th century, and the first systematic written use of the language happened in Toledo, a prominent c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
