banded coal

Banded coal is a type of coal characterized by visible bands of different components, primarily vitrinite and opaque material. These bands alternate, with bright coal containing more than 80 percent vitrinite and splint coal having over 30 percent opaque matter. Nonbanded coals, such as boghead and cannel coal, have a different composition and lack these distinct bands. Coal classification is crucial for commercial users and researchers, with rank being a primary classification based on the degree of coalification, influenced by burial depth and temperature. This process transforms peat into lignite, then subbituminous and bituminous coal, and finally anthracite, with increasing carbon content and decreasing moisture as rank increases.12