Analytical Methods for Coal and Coal Products, vol I
Coal in a aggregate of heterogeneous subtances composed of organic materials. The organic Materials are derived mainly from plant remains which have undergone various degrees of decomposition in the peat swamps and physical and chemical alteration after burial. Optically homogeneous organic materials in coal are called macerals. There are three major groups of maceral, namely, vitrinite, liptinite (exinite) , and inertinite groups. Inorganic materials in coal consist primarily of mineral matter, among them chiefly clay minerals, carbonates, sulfides, and sulfates, and many others in relatively small quantities.
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