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Vivianite Group
Vivianite () is a hydrated iron(II) phosphate mineral found in a number of geological environments. Small amounts of manganese Mn2+, magnesium Mg2+, and calcium Ca2+ may substitute for iron Fe2+ in its 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 Prism (geometry), prismatic to flattened crystals. Vivianite crystals are often found inside fossil shells, such as those of bivalves and gastropods, or attached to fossil bone. Vivianite can also appear on the iron coffins or on the corpses of humans as a result of a chemical reaction of the decomposing body with the iron enclosure. It was named by Abraham Gottlob Werner, the "father of German geology", 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, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phosphate Mineral
Phosphate minerals are minerals that contain the tetrahedrally coordinated phosphate () anion, sometimes with arsenate () and vanadate () substitutions, along with 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 from the apatite group of minerals. It is the major resource mined to produce phosphate fertilizers for the agricultural industry. Phosphate is also used in animal feed supplements, food preservatives, anti-corrosion agents, cosmetics, fungicides, ceramics, water treatment and metallurgy. The production of fertilizer is the largest source responsible for minerals mined for their phosphate content. Phosphate minerals are often used to control rust, and to prevent corrosion on ferrous materials applied with ele ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mineral
In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance 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 Geology, geological definition of mineral normally excludes compounds that occur only in living organisms. However, some minerals are often biogenic (such as calcite) or 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 (geology), 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 (geology), aggregate of two or more different types of minerals, spaci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cation
An ion () is an atom or molecule with a net electrical charge. The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a proton, which is considered to be positive by convention. The net charge of an ion is not zero because its total number of electrons is unequal to its total number of protons. A cation is a positively charged ion with fewer electrons than protons (e.g. K+ ( potassium ion)) while an anion is a negatively charged ion with more electrons than protons (e.g. Cl− ( chloride ion) and OH− ( hydroxide ion)). Opposite electric charges are pulled towards one another by electrostatic force, so cations and anions attract each other and readily form ionic compounds. Ions consisting of only a single atom are termed ''monatomic ions'', ''atomic ions'' or ''simple ions'', while ions consisting of two or more atoms are termed polyatomic ions or ''molecular ions''. If only a + or − is present, it indic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metal
A metal () is a material that, when polished or fractured, shows a lustrous appearance, and conducts electrical resistivity and conductivity, electricity and thermal conductivity, heat relatively well. These properties are all associated with having electrons available at the Fermi level, as against nonmetallic materials which do not. Metals are typically ductile (can be drawn into a wire) and malleable (can be shaped via hammering or pressing). A metal may be a chemical element such as iron; an alloy such as stainless steel; or a molecular compound such as polythiazyl, polymeric sulfur nitride. The general science of metals is called metallurgy, a subtopic of materials science; aspects of the electronic and thermal properties are also within the scope of condensed matter physics and solid-state chemistry, it is a multidisciplinary topic. In colloquial use materials such as steel alloys are referred to as metals, while others such as polymers, wood or ceramics are nonmetallic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Divalent
In chemistry, the valence (US spelling) or valency (British spelling) of an atom is a measure of its combining capacity with other atoms when it forms chemical compounds or molecules. Valence is generally understood to be the number of chemical bonds that each atom of a given chemical element typically forms. Double bonds are considered to be two bonds, triple bonds to be three, quadruple bonds to be four, quintuple bonds to be five and sextuple bonds to be six. In most compounds, the valence of hydrogen is 1, of oxygen is 2, of nitrogen is 3, and of carbon is 4. Valence is not to be confused with the related concepts of the coordination number, the oxidation state, or the number of valence electrons for a given atom. Description The valence is the combining capacity of an atom of a given element, determined by the number of hydrogen atoms that it combines with. In methane, carbon has a valence of 4; in ammonia, nitrogen has a valence of 3; in water, oxygen has a valence ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
St Agnes, Cornwall
St Agnes () is a civil parish and town on the north coast of Cornwall, England, United Kingdom. The village is about north of Redruth and southwest of Newquay. ''and'' An electoral ward exists stretching as far south as Blackwater. The population at the 2011 census was 7,565. The town of St Agnes, a popular coastal tourist spot, lies on a main road between Redruth and Perranporth. It was a prehistoric and modern centre for mining of copper, tin and arsenic until the 1920s. Local industry has also included farming, fishing and quarrying, and more recently tourism. The St Agnes district has a heritage of industrial archaeology and much of the landscape is of considerable geological interest. There are also stone-age remains in the parish. The manor of Tywarnhaile was one of the 17 Antiqua maneria of the Duchy of Cornwall. Geography St Agnes, on Cornwall's north coast along the Atlantic Ocean, is in the Pydar hundred and rural deanery. St Agnes is situated along t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Truro
Truro (; ) is a City status in the United Kingdom, cathedral city and civil parish in Cornwall, England; it is the southernmost city in the United Kingdom, just under west-south-west of Charing Cross in London. It is Cornwall's county town, sole city and a centre for administration, leisure and retail trading. Its population was 18,766 in the United Kingdom 2011 Census, 2011 census. People of Truro are called Truronians. It grew as a trade centre through its port and as a stannary town for tin mining. It became mainland Britain's southernmost city in 1876, with the founding of the Diocese of Truro. It is home to Cornwall Council, the Royal Cornwall Museum, Truro Cathedral, the Hall for Cornwall and Cornwall's High Court of Justice, Courts of Justice. Toponymy Truro's name may derive from the Cornish language, Cornish ''tri-veru'' meaning "three rivers", but authorities such as the ''Oxford Dictionary of English Place Names'' have doubts about the "tru" meaning "three". An expe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Henry Vivian
John Henry Vivian FRS (9 August 1785 – 10 February 1855) was a Welsh industrialist and politician of Cornish extraction. He was a member of the Vivian family. Vivian was the son of John Vivian (1750–1826), of Truro, Cornwall, and his wife Betsey, daughter of the Reverend Richard Cranch, and the brother of Hussey Vivian, 1st Baron Vivian. He owned copper mining, copper smelting and trading businesses in Swansea (Vivian & Sons), Liverpool, Birmingham and London. Between 1832 and 1855 he sat as Member of Parliament for Swansea District. He was a fellow of the Royal Society, a major in the Royal Stannary Artillery, a justice of the peace and a deputy lieutenant.Burke (1928) Vivian married Sarah, eldest daughter of Arthur Jones, of Reigate on 30 October 1816. Their eight children included Henry Vivian, 1st Baron Swansea, Sir Arthur Vivian and Glynn Vivian. He died on 10 February 1855. His wife survived him by over 30 years and died on 8 September 1886. The mineral vi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abraham Gottlob Werner
Abraham Gottlob Werner (; 25 September 174930 June 1817) was a German geologist A geologist is a scientist who studies the structure, composition, and History of Earth, history of Earth. Geologists incorporate techniques from physics, chemistry, biology, mathematics, and geography to perform research in the Field research, ... who set out an early theory about the Stratigraphy, stratification of the Earth's crust and propounded a history of the Earth that came to be known as Neptunism. While most tenets of Neptunism were eventually set aside, Werner is remembered for his demonstration of Succession (geology), chronological succession in rocks; for the zeal with which he infused his pupils; and for the impulse he thereby gave to the study of geology. He has been called the "father of German geology". Life Werner was born in Wehrau (now Osiecznica, Lower Silesian Voivodeship), a village in Prussian Silesia. His family had been involved in the mining industry for many years ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastropod
Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and from the land. There are many thousands of species of sea snails and sea slug, slugs, as well as freshwater snails, freshwater limpets, land snails and slugs. The class Gastropoda is a diverse and highly successful class of mollusks within the phylum Mollusca. It contains a vast total of named species, second only to the insects in overall number. The fossil history of this class goes back to the Furongian, Late Cambrian. , 721 family (taxonomy), families of gastropods are known, of which 245 are extinct and appear only in the fossil record, while 476 are currently neontology, extant living fossil, with or without a fossil record. Gastropoda (previously known as univalves and sometimes spelled "Gasteropoda") are a major part of the phylum Mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
