Magnesite

Industrial applications. Raw magnesite is used for surface coatings, landscaping, ceramics, and as a fire retardant. 

Forsterite is also a double oxide. It is a mixture of magnesia and silica forming a silicate. 

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Structure defects decrease conductivity of the studied material, and then the intensity of the induced magnetic field is small and the signal received by the probe Hp is big (Fig.2). Low conductivity of austenite is a defects of the structure in case of residual austenite in the martensite structure, which with regard to the magnesite structure is as 1 5. Eddy currents produced in the studied area are subject to excitation in effect of small conductivity of austenite grains in the structure of the studied material. 

It is also used as a reducing agent in the production of pure uranium and other metals from their salts. The hydroxide (milk of magnesia), chloride, sulfate (Epsom salts), and citrate are used in medicine. Dead-burned magnesite is employed for refractory purposes such as brick and liners in furnaces and converters. 

Magnesias Magnesia-spin el Magnesil Magnesio ferrite Magnesite... 

Texture. All limestones are crystalline, but there is tremendous variance in the size, uniformity, and arrangement of their crystal lattices. The crystals of the minerals calcite, magnesite, and dolomite are rhombohedral those of aragonite are orthorhombic. The crystals of chalk and of most quick and hydrated limes are so minute that these products appear amorphous, but high powered microscopy proves them to be cryptocrystalline. Hydrated lime is invariably a white, fluffy powder of micrometer and submicrometer particle size. Commercial quicklime is used in lump, pebble, ground, and pulverized forms. 

Norsk Hydro, Norway electrolytic—seawater, brine, magnesite 55... 

This reaction, carried out at high (700—800°C) temperatures, also converts several impurities ia the ores to volatile chlorides, thus purifyiag the MgCl2. A patent describes the carbothermal cblorination of magnesite direcdy (15). 

Because of this soHd solution, natural magnesite contains varying amounts of iron which can affect the ultimate use of the material. Small amounts of calcium and manganese may also be present. 

J. Wicken and L. Duncan, "Magnesite and Related Minerals," in Industrial Minerals and Rocks, 5th ed., American Institute of Mining, Metallurgical and Petroleum Engineers, New York, 1983. 

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