Research Results For 'Dolomite'

THOMAS-GILCHRIST PROCESS

In metallurgy, the Thomas-Gilchrist Process was an important improvement on the Bessemer process of producing steel. It was devised by Sidney Gilchrist Thomas, a magistrate's clerk in London, and put into practical shape by him in conjunction with his cousin, Percy W Gilchrist, a chemist at Blaenavon Ironworks in Wales, where the process was first tried about 1877. The aim of the process is to eliminate phosphorus from the steel produced, and thus to permit the use of pig irons containing the normal proportions of that element. The phosphorus is removed from the molten iron in the converter and concentrated in a slag by adding an excess of lime as flux, the lining of the converter being prepared of a basic material such as dolomite limestone, instead of an acid material such as the ordinary siliceous firebrick. Hence the process is often described as the basic process, and the product as basic iron or steel. The process gives rise to a valuable by-product known as Thomas or phosphatic slag fertiliser.
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ANATASE

Anatase is one of the crystalline forms of titanium oxide, and an important source of the metal titanium. Anatase has the formulae TiO2 and a relative hardness of 6. It is found in granite, gneiss, mica schist, metamorphic limestone, and dolomite. Anatase may be present as an accessory mineral in the rocks or in a quartz vein traversing it. It is used as a coating for welding rods and as a source of titanium.
Research Anatase

ANKERITE

Ankerite is a mineral closely related to dolomite, but containing iron. Ankerite was first identified in Styria, Austria and was confirmed as a distinct species in 1825. It is named after mineralogist Professor Mathias Anker of Austria.
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BARITE

Barite or baryte is major ore of barium. It has a high specific gravity for a light coloured mineral and is a common gangue mineral in hydrothermal veins or as a replacement mineral in veins of limestone and dolomite. It is associated with lead, silver and antimony sulphides. It has the formulae BaSO4 and a relative hardness of 3. It was the first mineral to be found to be luminescent when heated, and led to the discovery of the luminescence of minerals. It is used as an ore of barium, for refining sugar, in the paper industry and as a pigment.
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BROWN SPAR

Brown Spar is the name given to some crystalline varieties of dolomite tinged with peroxide of Iron
Research Brown Spar

CELESTITE

Celestite (also known as celestine) is a natural sulphate of strontium, so named from its occasional delicate blue colour. It occurs crystallized, also in compact massive and fibrous forms. Celestite is often found disseminated through limestone or sandstone, or lining cavities in such rocks. It is associated with calcite, dolomite, gypsum, sulphur, fluorite and is also found as a gangue mineral in lead veins. It is an important source of strontium and is used to prepare nitrate of strontium for fireworks and tracer bullets, and in the refining of beet sugar. It has the formulae SrSO4 and a relative hardness of 4.
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CONITE

Conite is a magnesian variety of dolomite.
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DANBURITE

Danburite is a mineral and gemstone which occurs with feldspar in dolomite, granite pegmatites, and non-marine evaporates. It is commonly associated with apophyllite, cassiterite, calcite, chalcopyrite, corundum, fluorite, pyrite, sphalerite and quartz. Danburite is a borosilicate of calcium and has the formulae CaB2(Si2O4)2 and a relative hardness of 7. It was named after the place where it was discovered - Danbury in Connecticut. Danburite is often colourless, but may sometimes appear pale yellow, pale pink, brown or white and nearly always has a striking glassy or greasy sheen.
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DOLOMITE

Dolomite is a potential ore of magnesium and occurs in widely extended rock masses as dolomitic limestone. It is often intimately mixed with calcite. It is formed from ordinary limestone by the replacement of calcium by magnesium. It has the formulae CaMg(CO3)2 and a relative hardness of 4.
Research Dolomite

DOLOSTONE

Dolostone is a sedimentary rock composed of at least fifty percent dolomite and is formed from limestone deposits. It is creamy, grey or white in colour, compact and earthy, usually a fine to medium grained rock popular as a building stone.
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