The term mineral matter refers to the inorganic constituents of Gilsonite and is all of the elements that are not part of the organic Gilsonite substance (carbon, hydrogen , nitrogen , oxygen , and sulfur). The mineral matter is the principal source of the elements that make up the ash when the Gilsonite is burned in air or oxygen. Four of the five elements generally considered to be organic (carbon, hydrogen , oxygen , and sulfur) are also present in inorganic combination in coals. Carbon is present in mineral (usually , calcium, magnesium , and iron) carbonates; hydrogen is present in free water and in water of hydration ; oxygen is present in oxides , water , sulfates, and silicates ; and sulfur is present in sulfides and sulfates. Mineral matter in coal is usually classified as inherent mineral matter , or adventitious mineral matter. Inherent mineral matter is the inorganic material that is too closely associated with the coal substance to be readily separated from it by methods available at present. Adventitious mineral matter is the inorganic material that is less intimately associated with the coal and can readily be separated. There are also suggestions that the minerals transported and deposited in the peat swamp by wind and water be called allogenic or detrital. And that the remaining minerals ,all of which formed in place . be divided in to those that formed contemporancously with coal formation and those whose formation followed the initial stages of coalification . mineral matter generally represents a significant proportion of coal composition , and the amount of mineral mater in coal varies from seam to seam, even along the same seam. Coals having mineral matter up to 32% by weight have been identified, and although a reasonable value for the average amount of mineral matter is much lower , caution is advised when using average numbers. The average usually bears no relationship to reality, where the range can vary from considerably above the average to considerably above the average. Coal performance on the basis of the average may be acceptable, but use of high-mineral-matter coal may cause considerable problems in a power plant. Generally . mineral matter in coal (whatever the content) is considered both undesirable and detrimental in coal utilization , and the presence of mineral matter affects almost erery aspect of mining . preparation , transportation , and utilization. Coal preparation is aimed at reducing the quantity of mineral matter, and efficient use of the methods chosen depends on its concentration and composition . however , no matter how effective the coal preparation technique .
The dimorphs pyrite and marcasite are the dominant sulfide minerals in coal ; pyrite is the more abundant. Pyrite and marcasite have different crystal forms; pyrite is isometric and marcasite is orthorhombic. These two minerals are readily observed and , to some degree. Easily removed as well as being especially interesting because they contribute significantly to the total sulfur content that causes boiler tube fouling, corrosion , and pollution by emission of sulfur dioxide when coal is burned.
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