Abstract
Abstract Organically combined sulfur and inorganic sulfides comprise nearly all the sulfur found in coals. Pyrite and marcasite are the dominant iron sulfides in coals. The wide range of sizes and forms they exhibit results from the different geochemical environments that affected their formation in the coals during their long history. Other sulfides that have been reported are sphalerite, galena, chalcopyrite, and arsenopyrite. Sulfate materials are much less common in fresh coal samples, but a variety of ferrous and ferric sulfates form when the ferrous sulfides are oxidized. Removal of inorganic sulfur from coal by standard specific gravity techniques is, at best, incomplete.
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