|
Coronadite Group
Coronadite is the lead endmember of the coronadite group, a family of tectomanganates with a 2 × 2 tunnel structure. The mineral was named after Francisco Vasquez de Coronado who was an explorer of southwest US. The name was made up by Waldemar Lindgren in 1905. It is chemically related to ferricoronadite, an analogue, as well as cryptomelane, hollandite Hollandite (chemical formula: Ba(Mn4+6Mn3+2)O16) is a manganese oxide mineral. Its structure consists of double chains of MnO6 octahedra delimiting 2 × 2 tunnels. The electrostatic charge created by the Mn3+ for Mn4+ substitution is balanced by ..., manjiroite and strontiomelane. File:Hollandite.jpg, Polyhedral representation of the 2 × 2 tunnel structure of coronadite. The black atoms represent Pb. References {{Reflist Manganese minerals Lead minerals Minerals described in 1904 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lead
Lead () is a chemical element; it has Chemical symbol, symbol Pb (from Latin ) and atomic number 82. It is a Heavy metal (elements), heavy metal that is density, denser than most common materials. Lead is Mohs scale, soft and Ductility, malleable, and also has a relatively low melting point. When freshly cut, lead is a shiny gray with a hint of blue. It tarnishes to a dull gray color when exposed to air. Lead has the highest atomic number of any stable nuclide, stable element and three of its isotopes are endpoints of major nuclear decay chains of heavier elements. Lead is a relatively unreactive post-transition metal. Its weak metallic character is illustrated by its Amphoterism, amphoteric nature; lead and lead oxides react with acids and base (chemistry), bases, and it tends to form covalent bonds. Lead compounds, Compounds of lead are usually found in the +2 oxidation state rather than the +4 state common with lighter members of the carbon group. Exceptions are mostly limited ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endmember
An endmember (also end-member or end member) in mineralogy is a mineral that is at the extreme end of a mineral series in terms of purity of its chemical composition. Minerals often can be described as solid solutions with varying compositions of some chemical elements, rather than as substances with an exact chemical formula. There may be two or more endmembers in a group or series of minerals. For example, forsterite () and fayalite () are the two end-members of the olivine solid-solution series, varying in and in their chemical composition. So, the chemical formula of olivine can be better expressed as or . As another example, the tectosilicate feldspar can be described as a solid solution of the endmembers K-feldspar (), albite () and anorthite (). Industrial Minerals Association. Retrieved on February 9, 2008. A specific feldspar can have varying quantities of potassium (K), sodium (Na) and calcium Calcium is a chemical element; it has symbol Ca and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coronadite Group
Coronadite is the lead endmember of the coronadite group, a family of tectomanganates with a 2 × 2 tunnel structure. The mineral was named after Francisco Vasquez de Coronado who was an explorer of southwest US. The name was made up by Waldemar Lindgren in 1905. It is chemically related to ferricoronadite, an analogue, as well as cryptomelane, hollandite Hollandite (chemical formula: Ba(Mn4+6Mn3+2)O16) is a manganese oxide mineral. Its structure consists of double chains of MnO6 octahedra delimiting 2 × 2 tunnels. The electrostatic charge created by the Mn3+ for Mn4+ substitution is balanced by ..., manjiroite and strontiomelane. File:Hollandite.jpg, Polyhedral representation of the 2 × 2 tunnel structure of coronadite. The black atoms represent Pb. References {{Reflist Manganese minerals Lead minerals Minerals described in 1904 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Francisco Vasquez De Coronado
Francisco is the Spanish and Portuguese form of the masculine given name ''Franciscus''. Meaning of the name Francisco In Spanish, people with the name Francisco are sometimes nicknamed " Paco". San Francisco de Asís was known as ''Pater Communitatis'' (father of the community) when he founded the Franciscan order, and "Paco" is a short form of ''Pater Communitatis''. In areas of Spain where Basque is spoken, " Patxi" is the most common nickname; in the Catalan areas, "Cesc" (short for Francesc) is often used. In Spanish Latin America and in the Philippines, people with the name Francisco are frequently called " Pancho". " Kiko"and "Cisco" is also used as a nickname, and "Chicho" is another possibility. In Portuguese, people named Francisco are commonly nicknamed " Chico" (''shíco''). People with the given name * Pope Francis (1936-2025) is rendered in the Spanish, Portuguese and Filipino languages as Papa Francisco * Francisco Acebal (1866–1933), Spanish writer and aut ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Waldemar Lindgren
Waldemar Lindgren (February 14, 1860 – November 3, 1939) was a Swedish-American geologist and a founder of modern economic geology. Life Lindgren was born in Vassmolösa, Kalmar Municipality, Småland, Sweden, the son of Johan and Emma Lindgren. Johan was a judge and member of parliament, Emma the daughter of a clergyman. He attended the Freiberg Mining Academy, Germany, graduating as a mining engineer in 1882. In 1884, Lindgren began a 31-year career with the U.S. Geological Survey, working on ore deposits in the Rocky Mountains. In 1905, he helped found the journal Economic Geology. In 1912, he was appointed head of the Department of Geology at the Massachusetts Institute of Technology. Lindgren was elected to the United States National Academy of Sciences in 1909, the American Academy of Arts and Sciences in 1912, and the American Philosophical Society in 1917. He was elected a foreign member of the Royal Swedish Academy of Sciences in 1931. He was a fellow of the Mine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ferricoronadite
Ferricoronadite is a lead mineral discovered in 2016 by Chukanov et al. near Nezhilovo, North Macedonia. Its simplified elemental formula is Pb( Mn64+ Fe23+) O16, and it is found in a matrix of zinc-dominant spinels. Ferricoronadite is named as an analogue of coronadite Coronadite is the lead endmember of the coronadite group, a family of tectomanganates with a 2 × 2 tunnel structure. The mineral was named after Francisco Vasquez de Coronado who was an explorer of southwest US. The name was made up by Waldemar .... References Lead minerals Iron minerals Manganese minerals Geology of North Macedonia Minerals described in 2016 {{mineral-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryptomelane
Cryptomelane (K(Mn4+,Mn2+)8O16) is the potassium endmember of the hollandite group, a family of tectomanganates with a 2 × 2 tunnel structure. In 1942 the name ''cryptomelane'' was proposed as part of an effort to sort out the manganese oxide minerals referred to as ''psilomelane''. Cryptomelane was identified and defined based on X-ray diffraction studies of samples from Tombstone, Arizona; Deming, New Mexico; Mena, Arkansas; and Philipsburg, Montana. Cryptomelane was approved in 1982 by the International Mineralogical Association (IMA). The type locality is the Tombstone District, Cochise County, Arizona, US. The name comes from the Greek for hidden and black, in reference to the confusion and difficulty in recognition of the various black manganese oxide minerals referred to as ''psilomelane'', the collective term for hard manganese oxides. It is of rather common occurrence in oxidized manganese deposits where it occurs as replacements and open space fillings in veins and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hollandite
Hollandite (chemical formula: Ba(Mn4+6Mn3+2)O16) is a manganese oxide mineral. Its structure consists of double chains of MnO6 octahedra delimiting 2 × 2 tunnels. The electrostatic charge created by the Mn3+ for Mn4+ substitution is balanced by cations in the tunnels. Their nature determines the mineral species: Ba for hollandite, K for cryptomelane, Pb for coronadite, Sr for strontiomelane, Tl for thalliomelane, and Na for manjiroite. Pure species are rare and most 2 × 2 tectomanganates contain mixtures of several types of tunnel cations. A mineral, with the chemical composition BaMn4+6Fe3+2O16, that was first found in the Kajlidongri mine in the Jhabua district of Madhya Pradesh, India, had the name ''hollandite'' until it was reclassified as ''ferrihollandite'' by the International Mineralogical Association Founded in 1958, the International Mineralogical Association (IMA) is an international group of 40 national societies. The goal is to promote the science of mineralo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strontiomelane
Strontiomelane is an oxide mineral from the coronadite group in the hollandite supergroup.Page ''Strontiomelane: Mineral information, data and localities'' on Specimens of the mineral appear very similar to other manganese oxides from the same group, such as the Ba-analogue hollandite. The type locality is the Praborna mine in Saint-Marcel, Italy Italy, officially the Italian Republic, is a country in Southern Europe, Southern and Western Europe, Western Europe. It consists of Italian Peninsula, a peninsula that extends into the Mediterranean Sea, with the Alps on its northern land b .... References External links Strontium minerals Manganese(III,IV) minerals Oxide minerals Monoclinic minerals Minerals described in 1999 {{oxide-mineral-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manganese Minerals
Manganese is a chemical element; it has Symbol (chemistry), symbol Mn and atomic number 25. It is a hard, brittle, silvery metal, often found in minerals in combination with iron. Manganese was first isolated in the 1770s. It is a transition metal with a multifaceted array of industrial alloy uses, particularly in stainless steels. It improves strength, workability, and resistance to wear. Manganese oxide is used as an oxidising agent, as a rubber additive, and in glass making, fertilisers, and ceramics. Manganese sulfate can be used as a fungicide. Manganese is also an essential human dietary element, important in macronutrient metabolism, bone formation, and free radical defense systems. It is a critical component in dozens of proteins and enzymes. It is found mostly in the bones, but also the liver, kidneys, and brain. In the human brain, the manganese is bound to manganese metalloproteins, most notably glutamine synthetase in astrocytes. Manganese is commonly found in labo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lead Minerals
Lead () is a chemical element; it has symbol Pb (from Latin ) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low melting point. When freshly cut, lead is a shiny gray with a hint of blue. It tarnishes to a dull gray color when exposed to air. Lead has the highest atomic number of any stable element and three of its isotopes are endpoints of major nuclear decay chains of heavier elements. Lead is a relatively unreactive post-transition metal. Its weak metallic character is illustrated by its amphoteric nature; lead and lead oxides react with acids and bases, and it tends to form covalent bonds. Compounds of lead are usually found in the +2 oxidation state rather than the +4 state common with lighter members of the carbon group. Exceptions are mostly limited to organolead compounds. Like the lighter members of the group, lead tends to bond with itself; it can form chains and polyhe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
