Concentrates of the petrographic components of a high volatile A bituminous coal were obtained by centrifugal separation in salt solutions of adjusted specific gravity. Samples containing 94% vitrinite, 86% exinite, 87% micrinite, and 96% fusinite were obtained. Various physical and chemical properties of the concentrates were determined, e.g., chemical composition, helium density, surface area, indices of refraction, and X-ray scattering intensities. The components were found to differ considerably in chemical composition and in most of the physical properties. Some of the physical properties could be related to chemical composition.

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