MINERALOGY

Jun 28th, 2015
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Mineral: The study of the characters of minerals ( eg: quartz, pyroxene, amphibole, mica, chlorite, garnet) is known as Mineralogy. A mineral is a naturally occurring homogeneous substance, inorganically formed with a definite chemical composition, with a certain physical properties and crystalline structures

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Notes on Engineering Geology for Civil engg Compiled by Dr G SUBBARAO M.Sc. ,M.Phil., Ph.D., C.S.M.UNIT: II - MINERALOGYMineral: The study of the characters of minerals ( eg: quartz, pyroxene, amphibole, mica, chlorite, garnet) is known as Mineralogy. A mineral is a naturally occurring homogeneous substance, inorganically formed with a definite chemical composition, with a certain physical properties and crystalline structuresUnder favourable conditions, the internal atomic structure of minerals result in the development of a definite external geometrical shape ie crystal form.The stability of minerals depends on temperature, pressure and chemical composition of the environment. At present more than 3000 mineral species have been established. The earths crust is mainly composed of feldspars and quartz and accounts 55% and 10% respectively. Pyroxenes, amphiboles, chlorites, micas, clay carbonates are widely spread too. Following a few rare minerals are also common: PhenaciteBe2 (SiO4)Bertrandite Be4 (Si2O7) (OH)4BaddeleyiteZr O2Cordierite Hg3 S2 Cl2Explanation:Homogeneous : all parts of the minerals should possess the same physical and chemical characters.Crystalline: possess atomic structure in a mineral.Crystal: A crystal may be defined as a natural solid body bounded by smooth and plain surfaces, arranged geometrically

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