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Rank
Coals vary in composition and properties in accordance with the extent of alteration, or degree of coalification, of the original plant material from which they are derived. The concept of rank is used to indicate the stage of alteration obtained by a particular coal; the greater the alteration, the higher the rank of the coal. Thus, lignites and sub-bituminous coals are of low-rank, while semi¬anthracites and anthracites are of high¬rank.