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Bituminous coal is dark brown to black, hard, but friable. It is commonly composed of thin bands of alternating bright and dull material. Though bituminous coal varies in its chemical composition, a typical composition is about 84.4% carbon, 5.4% hydrogen, 6.7% oxygen, 1.7% nitrogen, and 1.8% sulfur, on a weight basis. Its bank density (the density of a coal seam prior to breaking up during mining) is about 1346 kg/m³ (84 lb/ft³) while the bulk density

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