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rare-earth-metals silicate

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  • Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry       The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …   Universalium

  • mineral deposit — Introduction       aggregate of a mineral in an unusually high concentration.       About half of the known chemical elements (chemical element) possess some metallic (metal) properties. The term metal, however, is reserved for those chemical… …   Universalium

  • Abundance of the chemical elements — Estimated proportions of matter, dark matter and dark energy in the universe. Only the fraction of the mass and energy in the universe labeled atoms is composed of chemical elements. The abundance of a chemical element measures how relatively… …   Wikipedia

  • Hydrogen — This article is about the chemistry of hydrogen. For the physics of atomic hydrogen, see Hydrogen atom. For other meanings, see Hydrogen (disambiguation). ← hydrogen → helium …   Wikipedia

  • magnesium processing — Introduction       preparation of the ore for use in various products.       Magnesium (Mg) is a silvery white metal that is similar in appearance to aluminum but weighs one third less. With a density of only 1.738 grams per cubic centimetre, it… …   Universalium

  • Phosphor — A phosphor is a substance that exhibits the phenomenon of phosphorescence (sustained glowing after exposure to energized particles such as electrons).Phosphors are transition metal compounds or rare earth compounds of various types. The most… …   Wikipedia

  • cobalt processing — Introduction       preparation of the metal for use in various products.       Below 417° C (783° F), cobalt (Co) has a stable hexagonal close packed crystal structure. At higher temperatures up to the melting point of 1,495° C (2,723° F), the… …   Universalium

  • gadolinite — /gad l euh nuyt /, n. a silicate mineral from which the rare earth metals gadolinium, holmium, and rhenium are extracted. [1795 1805; named after J. Gadolin (1760 1852), Finnish chemist; see ITE1] * * * …   Universalium

  • allanite — noun Any of a group of silicate minerals that are a source of rare earth metals …   Wiktionary

  • allanite — [ alənʌɪt] noun a brownish black mineral of the epidote group, consisting of a silicate of rare earth metals, aluminium, and iron. Origin C19: named after the Scottish mineralogist Thomas Allan + ite1 …   English new terms dictionary

  • gadolinite — gad•o•lin•ite [[t]ˈgæd l əˌnaɪt[/t]] n. mir a silicate mineral from which the rare earth metals gadolinium, holmium, and rhenium are extracted • Etymology: 1795–1805; after J. Gadolin (1760–1852), Finnish chemist; see ite I …   From formal English to slang

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