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Ojuela Mine
Ojuela was a small mining settlement located northwest of the nearest town Mapimí, northwest. The settlement is now well known as a ghost town as a result of the ore being exhausted. Ojuela was established after the discovery of abandoned gold and silver mines in the area in 1598. The Ojuela Mine produced a large quantity of mineral during the last part of the 19th century. With the advent of the railroad, all the extracted ore were transported away from the mine by train and processed in the nearby town of Mapimí. The origins of the mine can be traced to 1598 when it was discovered by a group of Spanish prospectors. After this discovery, the mineral potential was confirmed and the exploitation began. Soon the foundations of the town were set. The town was located at the top of a mountain in close proximity to the mine's main access. This was done in order to have the workers and other mining staff as close as possible to the operation. The town developed rapidly from a smal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossil
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Paleontology is the study of fossils: their age, method of formation, and evolutionary significance. Specimens are usually considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years old to 4.1 billion years old. Early edition, published online before print. The observation in the 19th century that certain fossils were associated with certain rock strata led to the recognition of a geological timescale and the relative ages of different fossils. The development of radiometric dating techniques in the early 20th century allowed scientists to quantitatively measure the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Köttigite
Köttigite is a rare hydrated zinc arsenate which was discovered in 1849 and named by James Dwight Dana in 1850 in honour of Otto Friedrich Köttig (18241892), a German chemist from Schneeberg, Saxony, who made the first chemical analysis of the mineral. It has the formula and it is a dimorph of metaköttigite, which means that the two minerals have the same formula, but a different structure: köttigite is monoclinic and metaköttigite is triclinic. There are several minerals with similar formulae but with other cations in place of the zinc. Iron forms parasymplesite ; cobalt forms the distinctively coloured pinkish purple mineral erythrite and nickel forms annabergite . Köttigite forms series with all three of these minerals and they are all members of the vivianite group. The Vivianite Group is a group of monoclinic phosphates and arsenates with divalent cations. The group members are annabergite, arupite, babanekite, baricite, erythrite, hornesite, kottingite, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Legrandite
Legrandite is a rare zinc arsenate mineral, Zn2(AsO4)(OH)·(H2O). It is an uncommon secondary mineral in the oxidized zone of arsenic bearing zinc deposits and occurs rarely in granite pegmatite. Associated minerals include: adamite, paradamite, köttigite, scorodite, smithsonite, leiteite, renierite, pharmacosiderite, aurichalcite, siderite, goethite and pyrite. It has been reported from Tsumeb, Namibia; the Ojuela mine in Durango, Mexico and at Sterling Hill, New Jersey, US. It was first described in 1934 for an occurrence in the Flor de Peña Mine, Nuevo León Nuevo León () is a state in the northeast region of Mexico. The state was named after the New Kingdom of León, an administrative territory from the Viceroyalty of New Spain, itself was named after the historic Spanish Kingdom of León. With a ..., Mexico and named after M. Legrand, a Belgian mining engineer . References Zinc minerals Arsenate minerals Monoclinic minerals Minerals in space group 14 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adamite
Adamite is a zinc arsenate hydroxide mineral, Zn2 As O4O H. It is a mineral that typically occurs in the oxidized or weathered zone above zinc ore occurrences. Pure adamite is colorless, but usually it possess yellow color due to Fe compounds admixture. Tints of green also occur and are connected with copper substitutions in the mineral structure. Olivenite is a copper arsenate that is isostructural with adamite and there is considerable substitution between zinc and copper resulting in an intermediate called ''cuproadamite''. Zincolivenite is a recently discovered mineral being an intermediate mineral with formula CuZn(AsO4)(OH). Manganese, cobalt, and nickel also substitute in the structure. An analogous zinc phosphate, ''tarbuttite'', is known. Occurrence Adamite occurs as a secondary mineral in the oxidized zone of zinc- and arsenic-bearing hydrothermal mineral deposits. It occurs in association with smithsonite, hemimorphite, scorodite, olivenite, calcite, quartz and iron ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arsenate Mineral
Arsenate minerals usually refer to the naturally occurring orthoarsenates, possessing the (AsO4)3− anion group and, more rarely, other arsenates with anions like AsO3(OH)2− (also written HAsO42−) (example: pharmacolite Ca(AsO3OH).2H2O) or (very rarely) sO2(OH)2sup>− (example: andyrobertsite). Arsenite minerals are much less common. Both the Dana and the Strunz mineral classifications place the arsenates in with the phosphate minerals. Example arsenate minerals include: *Annabergite Ni3(AsO4)2·8H2O *Austinite CaZn(AsO4)(OH) *Clinoclase Cu3(AsO4)(OH)3 *Conichalcite CaCu(AsO4)(OH) *Cornubite Cu5(AsO4)2(OH)4 *Cornwallite Cu2+5(AsO4)2(OH)2 *Erythrite Co3(AsO4)2·8H2O *Mimetite Pb5(AsO4)3Cl *Olivenite Cu2(AsO4)OH Nickel–Strunz Classification -08- Phosphates IMA-CNMNC proposes a new hierarchical scheme (Mills et al., 2009). This list uses it to modify the Classification of Nickel–Strunz ( mindat.org, 10 ed, pending publication). *Abbreviations: **"*" - discredited ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mineral Collecting
Mineral collecting is the hobby of systematically collecting, identifying and displaying mineral specimens. Mineral collecting can also be a part of the profession of mineralogy and allied geologic specialties. Individual collectors often specialize in certain areas, for example collecting samples of several varieties of the mineral calcite from locations spread throughout a region or the world, or of minerals found in pegmatites. History Generally considered the "father of mineralogy", Georgius Agricola (1494–1555) was also an avid mineral collector. He wrote several books, including two of enduring significance: De Re Metallica, an early treatise on mining, and De Natura Fossilium, the first (1546) modern textbook of mineralogy. Another famous 16th century mineral collector was Holy Roman Emperor Rudolf II (1552–1612). He built a large mineral collection while employing Anselmus de Boodt (ca. 1550–1634), his court physician and another avid mineral collector, to ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Torreón
Torreón () is a city and seat of Torreón Municipality in the Mexican state of Coahuila. As of 2021, the city's population was 735,340. The metropolitan population as of 2015 was 1,497,734, making it the ninth-biggest metropolitan area in the country and the largest metropolitan area in the state of Coahuila, as well as one of Mexico's most important economic and industrial centers. The cities of Torreón; Gómez Palacio, Durango; Lerdo, Durango; Matamoros; Francisco I. Madero; San Pedro; Bermejillo, Durango; and Tlahualilo, Durango form the area of La Laguna or the Comarca Lagunera, a basin within the Chihuahuan Desert. The area was originally a center for ranching. With irrigation, the city became an important center for farming and the processing of cotton. In the middle of the 20th century, it became an industrial city. The cities (i.e. the metropolitan area) have industries in textiles, clothing and metals processing. Some important industries and companies have business ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Longest Suspension Bridge
The world's longest suspension bridges are listed according to the length of their main span (i.e. the length of suspended roadway between the bridge's towers). The length of main span is the most common method of comparing the sizes of suspension bridges, often correlating with the height of the towers and the engineering complexity involved in designing and constructing the bridge. If one bridge has a longer span than another it does not necessarily mean that the bridge is longer from shore to shore (or from abutment to abutment). Suspension bridges have the longest spans of any type of bridge. Cable-stayed bridges, the next longest design, are practical for spans up to just over 1 kilometre. Therefore, , the 31 longest bridges on this list are the 31 longest spans of all types of vehicular bridges (other than floating pontoon bridges). Currently, the 1915 Çanakkale Bridge in Turkey holds the record since opening to traffic in March 2022, with a span of . Since 1998, the Aka ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brooklyn Bridge
The Brooklyn Bridge is a hybrid cable-stayed/ suspension bridge in New York City, spanning the East River between the boroughs of Manhattan and Brooklyn. Opened on May 24, 1883, the Brooklyn Bridge was the first fixed crossing of the East River. It was also the longest suspension bridge in the world at the time of its opening, with a main span of and a deck above mean high water. The span was originally called the New York and Brooklyn Bridge or the East River Bridge but was officially renamed the Brooklyn Bridge in 1915. Proposals for a bridge connecting Manhattan and Brooklyn were first made in the early 19th century, which eventually led to the construction of the current span, designed by John A. Roebling. The project's chief engineer, his son Washington Roebling, contributed further design work, assisted by the latter's wife, Emily Warren Roebling. Construction started in 1870, with the Tammany Hall-controlled New York Bridge Company overseeing construction, although nume ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roebling Suspension Bridge
The John A. Roebling Suspension Bridge (formerly the Cincinnati-Covington Bridge) is a suspension bridge that spans the Ohio River between Cincinnati, Ohio, and Covington, Kentucky. When opened on December 1, 1866, it was the longest suspension bridge in the world at main span, which was later overtaken by John A. Roebling's most famous design of the 1883 Brooklyn Bridge at . Pedestrians use the bridge to get between the hotels, bars, restaurants, and parking lots in Northern Kentucky. The bar and restaurant district at the foot of the bridge on the Kentucky side is known as Roebling Point. Ramps were constructed leading directly from the bridge to the Dixie Terminal building used for streetcars. These provided Covington– Cincinnati streetcars "with a grade-separated route to the center of downtown, and the terminal building was originally intended to connect, via underground pedestrian passages, with the never-built Fountain Square Station of the infamous Cincinnati Subway." ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Washington Roebling
Washington Augustus Roebling (May 26, 1837 – July 21, 1926) was an American civil engineer who supervised the construction of the Brooklyn Bridge, designed by his father John A. Roebling. He served in the Union Army during the American Civil War as an officer at the Battle of Gettysburg. Education and military service The oldest son of Johanna (née Herting) and John A. Roebling, Washington was born in 1837 in Saxonburg, Pennsylvania, a town co-founded by his father and his uncle, Carl Roebling. His early schooling consisted of tutoring by Riedel and under Henne in Pittsburgh. He was sent to stay with Professor Lemuel Stephens of the Western University of Pennsylvania (now known as the University of Pittsburgh), where Roebling also attended some classes. Roebling eventually attended the Trenton Academy and acquired higher education in engineering at the Rensselaer Polytechnic Institute in Troy, New York, from 1854 to 1857. He wrote a thesis titled "Design for a Suspension ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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