In the United States it is generally agreed that the maceral concept of the nomenclature Stopes-Heerlen System fails to comprehend the effect of the stage of coalification on the nature of coal constituents. W. Spackman's interpretation of the maceral concept incorporates the ideas of variable coalification in suggesting a skeletal framework upon which a systematic classification can be built. The maceral concept, as interpreted by Spackman, implements the classification of the products of coalification. In this scheme, macerals possessing similar chemical and physical properties are assembled into maceral groups that can, in turn, be characterized by a comparatively restricted set of properties. Maceral groups possessing similar characteristics can be classified into maceral suites. Syn: Spackman system
Source:
Dictionary of Mining, Mineral, and Related Terms












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