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Messelite
Messelite is a mineral with formula Ca2(Fe2+,Mn2+)(PO4)2·2H2O. It was discovered in Germany and described in 1890. The mineral was subsequently discredited in 1940, reinstated and named ''neomesselite'' in 1955, and the name restored to ''messelite'' in 1959. Description Messelite is a translucent mineral that is white, pale greenish white, greenish gray, pink, or colorless. The mineral may be granular or occur as internally radial aggregates of lamellar crystals arranged as globes, hemispheres, or sheafs, up to . Messelite is a member of the fairfieldite group. History Messelite was discovered in Messel, Hesse, Germany, by a Dr. Spiegel who worked as technical director at a local factory. The specimen contained a number of crystals associated with carbonaceous material. It did not conform to any known mineral at the time, a fact confirmed when it was studied at a local mineralogical institute. The mineral was described by W. Muthmann in 1890 in the journal ''Zeitschrift für K ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Collinsite
Collinsite is a mineral with chemical formula . It was discovered in British Columbia, Canada, and formally described in 1927. It was named in honor of William Henry Collins (1878–1937), director of the Geological Survey of Canada. There are three varieties of the mineral: magnesian collinsite, zincian collinsite, and strontian collinsite. The crystal structure consists of polyhedral chains linked by weak hydrogen bonds. Description Collinsite is translucent and brown, chocolate-black, light brown, yellowish white, white, or colorless. It is colorless in thin section and light yellow-brown to colorless in transmitted light. The zincian variety of collinsite is pale blue. The mineral can occur with fibrous habit, as globular aggregates of crystals, as concentrically layered botryoidal masses, or as bladed or prismatic crystals up to . Collinsite is a member of the fairfieldite group. Hillite is the zinc analogue of collinsite and collinsite is the magnesium analogue of mess ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phosphate Mineral
Phosphate minerals contain the tetrahedrally coordinated phosphate (PO43−) anion along sometimes with arsenate (AsO43−) and vanadate (VO43−) substitutions, and chloride (Cl−), fluoride (F−), and hydroxide (OH−) anions that also fit into the crystal structure. The phosphate class of minerals is a large and diverse group, however, only a few species are relatively common. Applications Phosphate rock has high concentration of phosphate minerals, most commonly of the apatite group. It is the major resource mined to produce phosphate fertilizers for the agriculture sector. Phosphate is also used in animal feed supplements, food preservatives, anti-corrosion agents, cosmetics, fungicides, ceramics, water treatment and metallurgy. The largest use of minerals mined for their phosphate content is the production of fertilizer. Phosphate minerals are often used for control of rust and prevention of corrosion on ferrous materials applied with electrochemical conversion co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brazilianite
Brazilianite, whose name derives from its country of origin, Brazil, is a typically yellow-green phosphate mineral, most commonly found in phosphate-rich pegmatites. It occurs in the form of perfect crystals grouped in druses, in pegmatites, and is often of precious-stone quality. One noted deposit of brazilianite is in the surroundings of Conselheiro Pena, in Minas Gerais, Brazil. Some of these are found on leaves of muscovite with their strong silvery glitter, ingrown in their parent rock. The crystals, dark greenish-yellow to olive-green, sometimes measure up to in length and in width. Crystals of similar shape and dimensions have been discovered in another deposit in Minas Gerais, near Mantena, but they lack the perfection of the crystal form. Many brazilianite specimens found in mineral collections originated from the Palermo and the Charles Davis mines in Grafton County, New Hampshire. Composition Brazilianite, NaAl3(PO4)2(OH)4 is a hydrous sodium aluminium phosphate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triclinic Minerals
180px, Triclinic (a ≠ b ≠ c and α ≠ β ≠ γ ) In crystallography, the triclinic (or anorthic) crystal system is one of the 7 crystal systems. A crystal system is described by three basis vectors. In the triclinic system, the crystal is described by vectors of unequal length, as in the orthorhombic system. In addition, the angles between these vectors must all be different and may not include 90°. The triclinic lattice is the least symmetric of the 14 three-dimensional Bravais lattices. It has (itself) the minimum symmetry all lattices have: points of inversion at each lattice point and at 7 more points for each lattice point: at the midpoints of the edges and the faces, and at the center points. It is the only lattice type that itself has no mirror planes. Crystal classes The triclinic crystal system class names, examples, Schönflies notation, Hermann-Mauguin notation, point groups, International Tables for Crystallography space group number, orbifold, type, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Akademische Verlagsgesellschaft
The (AVG, AVg, Aka, AV; English: Academic publishing company) in Leipzig was an important German academic publisher, which was founded in 1906. The original Jewish owners of the publishing house and key employees were expropriated during the time of the Nazi regime, emigrated and founded new scientific publishing houses in other countries. The publishing house was then named . After World War II, in the German Democratic Republic (GDR/DDR) the Leipzig branch of the publishing house was transformed into in 1947 and 1951. This was dissolved in 1991 as a consequence of the German reunification. Between 1953 and 1983, another seeing itself as the legal successor of the original company existed in the Federal Republic of Germany (FRG/BRD) in Frankfurt am Main and Wiesbaden. Today, there are two German publishing houses claiming to stand in the tradition of the , AULA-Verlag and AKA-Verlag, although legally they are new and independent foundations. History founded an antiqu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Whitlockite
Whitlockite is a mineral, an unusual form of calcium phosphate. Its formula is Ca9(Mg Fe)(PO4)6PO3O H. It is a relatively rare mineral but is found in granitic pegmatites, phosphate rock deposits, guano caves and in chondrite meteorites. It was first described in 1941 and named for Herbert Percy Whitlock (1868–1948), American mineralogist and curator at the American Museum of Natural History in New York City. With regards to periodontal dentistry, magnesium whitlockite comprises one component of many of the inorganic content of calculus. It is found primarily in subgingival calculus (as opposed to supragingival calculus). It is also found more in posterior as opposed to anterior regions of the oral cavity. Historical evolution of whitlockite as distinct minerals Whitlockite is a member of the phosphate group of minerals with three distinct occurrences. For many years, these occurrences were thought to be identical. However, recent studies using x-ray and electron diffracti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vivianite
Vivianite () is a hydrated iron phosphate mineral found in a number of geological environments. Small amounts of manganese Mn2+, magnesium Mg and calcium Ca may substitute for iron Fe2+ in the structure.Gaines et al (1997) Dana’s New Mineralogy Eighth Edition. Wiley Pure vivianite is colorless, but the mineral oxidizes very easily, changing the color, and it is usually found as deep blue to deep bluish green prismatic to flattened crystals. Vivianite crystals are often found inside fossil shells, such as those of bivalves and gastropods, or attached to fossil bone. It was named by Abraham Gottlob Werner in 1817, the year of his death, after either John Henry Vivian (1785–1855), a Welsh-Cornish politician, mine owner and mineralogist living in Truro, Cornwall, England, or after Jeffrey G. Vivian, an English mineralogist. Vivianite was discovered at Wheal Kind, in St Agnes, Cornwall. Vivianite group Vivianite group minerals have the general formula A3(XO4)2·8H2O, where ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triphylite
Triphylite is a lithium iron(II) phosphate mineral with the chemical formula LiFePO4.IMA-CNMNC List of Mineral Names (May 2015), It is a member of the triphylite group and forms a complete series with the lithium manganese(II) phosphate, lithiophilite. Triphylite crystallizes in the |
Siderite
Siderite is a mineral composed of iron(II) carbonate (FeCO3). It takes its name from the Greek word σίδηρος ''sideros,'' "iron". It is a valuable iron mineral, since it is 48% iron and contains no sulfur or phosphorus. Zinc, magnesium and manganese commonly substitute for the iron resulting in the siderite-smithsonite, siderite- magnesite and siderite-rhodochrosite solid solution series. Siderite has Mohs hardness of 3.75-4.25, a specific gravity of 3.96, a white streak and a vitreous lustre or pearly luster. Siderite is antiferromagnetic below its Néel temperature of 37 K which can assist in its identification. It crystallizes in the trigonal crystal system, and are rhombohedral in shape, typically with curved and striated faces. It also occurs in masses. Color ranges from yellow to dark brown or black, the latter being due to the presence of manganese. Siderite is commonly found in hydrothermal veins, and is associated with barite, fluorite, galena, and others. It i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ludlamite
Ludlamite is a rare phosphate mineral with chemical formula . It was first described in 1877 for an occurrence in Wheal Jane mine in Cornwall, England and named for English mineralogist Henry Ludlam (1824–1880). Occurrence It occurs in granite pegmatites and as a hydrothermal alteration product of earlier phosphate bearing minerals in a reducing environment. It occurs associated with whitlockite, vivianite, triploidite, triplite, triphylite, siderite Siderite is a mineral composed of iron(II) carbonate (FeCO3). It takes its name from the Greek word σίδηρος ''sideros,'' "iron". It is a valuable iron mineral, since it is 48% iron and contains no sulfur or phosphorus. Zinc, magnesium and ..., phosphoferrite, fairfieldite and apatite. References External links Phosphate minerals Monoclinic minerals Minerals in space group 14 {{phosphate-mineral-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hureaulite
Hureaulite is a manganese phosphate with the formula . It was discovered in 1825 and named in 1826 for the type locality, Les Hureaux, Saint-Sylvestre, Haute-Vienne, Limousin, France. It is sometimes written as huréaulite, but the IMA does not recommend this for English language text.Burke, E. A. J. (2008): Tidying up Mineral Names: An IMA scheme for Suffixes, Hyphens and Diacritical Marks. Mineralogical Record, 39, 134 A complete series exists from lithiophilite, to triphylite, , including hureaulite, strengite, , stewartite, , and sicklerite, .Murdoch, Joseph (1943) Crystallography of Hureaulite. American Mineralogist 28: 19-24 Environment Hureaulite is a secondary mineral occurring in granite pegmatites. At the type locality it occurs in a zone of altered triphylite, , in pegmatite. Typically occurs very late in the sequence of formation of secondary phosphate minerals.Moore, P B, and Araki, T (1973) Hureaulite: its atomic arrangement. American Mineralogist 58: 302-307. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
