Geology of the area of spider net vein type magnesite occurrences in Phulad Lineament, western foot hill of Aravalli Mountain, western India 1. Phulad lineament is a thick sequence of mafic-ultramafic rocks along a major shear zone 2. It is running through the length of Aravalli Mountain Range (nearly 300 kms) 3. This represents ophiolite or a rift related metavolcanic suite made up of basalts and fractionated ultramafics. About the magnesite Chemical composition is MgCO3 is shown by empirical formula Mg (CO3); where elemental percentage is 28.83% Mg + 14.25% C +56.93 % O= 100%; molecular percentage is 47.80 % MgO + 52.20 % CO2. Molecular weight is 84.31 gm. Physical properties of magnesite Color- Colorless, white, grayish white, yellowish white, brownish white Habit- earthy or dull, clay like texture, no visible crystals, massive to granular Streak-white Cleavage –perfect Lusture-Vitreous Diaphaneity-transparent, translucent and opaque Fracture- Chonchoidal Britallity- brittle, very brittle Hardness-4 Density- 3 Luminescence- Fluorescent (Blue white with short UV and bright blue white with long UV) Bulk density(Electron density)-2.97 gm/cc Fermion Index- 0.03 Boson Index-0.97 Photoelectric - PEMagnesite=0.83 barns/electron U=PEMagnesite ˟ ρElectron Density=2.45 barns/cc Radioactivity- GRapi=0(Gamma Ray American Petroleum Institute Units) Magnesite is not Radioactive Origin- Ultramafic hosted vein type/ Skarn deposit USES Abrasives As a binder in grinding wheels Animal feed supplement Source of magnesium ions for chickens, cattle and other animals Boiler (oil-fired) additives Raises melting point of ash generated to produce a friable material that is easily removed; Reduces corrosion of steel pipes holding steam as well as sulphur emissions into the environment Boiler feed water treatment Reduces iron, silica and solids Chemicals Starting point for the production of other magnesium salts such as sulphate and nitrate Coatings Pigment extender in paint and varnish Construction Basic ingredient of oxychloride cements used for flooring, wallboard, fiber board and tile Electrical Semi-conductors, heating elements insulating filler between wire and outer sheath Fertilizers Source of essential magnesium for plant nutrition Foundries Catalyst and water acceptor in shell moulding Glass manufacture Ingredient for specialty, scientific and decorative glassware and fiberglass Insulation Light, flexible mats for insulating pipes Lubricating oils Additive to neutralize acids Pharmaceuticals Special grades of magnesium hydroxide, oxide and carbonate are used in antacids, cosmetics, toothpaste and ointments Plastic manufacture Filler, acid acceptor, thickener catalyst and pigment extender Refractory and ceramics Basic ingredient in product formulations for the steel industry Rubber compounding Filler, acid acceptor, anti-scorch ingredient, curing aid, pigment Steel industry Annealing process, coating for grain-oriented silicon steel used in electrical transformers Sugar refining Reduces scale build-up when used in juice clarification and precipitation Sulphite wood pulping Source of base of cooking liquors Uranium, Gallium and Boron processing Precipitation initiator by acid neutralization Waste water treatment As acid stream neutralizer precipitates heavy metals

• published: 09 Dec 2014
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