Nodules of spheroidal, lenticular, or irregular shape containing petrified plant remains and in some cases animal remains. They vary in size from about 1 to 40 cm or more; occasional specimens weigh more than 1 ton. Infrequently, an entire seam in a restricted area consists largely of coal balls. Coal balls consist mainly of calcareous, dolomitic, sideritic, pyritic, or siliceous material surrounding or impregnating plant and animal remains. They occur in brown coals (mainly sideritic balls) as well as in coals of higher rank generally lying within a coal seam but occasionally in the roof. Calcareous, dolomitic, and pyritic coal balls are commonly found in seams having marine strata in the roof. The distribution in seams is variable. They may occur in a broad zone running through a coalbed or be distributed irregularly in nests. Syn: torf dolomite
Source:
Dictionary of Mining, Mineral, and Related Terms












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