Classification and Rank of Coal . University of Kentuckya diagram illustrates classification and rank of coal: Peat, Lignite, sub-bituminous. For more infomation about download this image, please click here. The kinds.coal rank classification,ASTM D388 - 15 Standard Classification of Coals by Rank4.1 This classification establishes categories of coal based on gradational properties that depend principally on the degree of metamorphism to which the coal.
coal rank classification