a. The common variety of bituminous and subbituminous coal. It consists of a sequence of irregularly alternating layers or lenses of homogeneous black material having a brilliant vitreous luster; grayish-black, less brilliant, striated material usually of silky luster; and generally thinner bands or lenses of soft, powdery, and fibrous particles of mineral charcoal. The difference in luster of the bands is greater in bituminous than in subbituminous coal. Also called bright-banded coal; common-banded coal.
b. Coal composed of roughly parallel, dull and bright layers. BS, 4
Source: Dictionary of Mining, Mineral, and Related Terms












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