1. Soft coal, containing about 80 percent carbon and 10 percent oxygen.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
     
  2. a. Coal that ranks between subbituminous coal and anthracite and that contains more than 14% volatile matter (on a dry, ash-free basis) and has a calorific value of more than 11,500 Btu/lb (26.7 MJ/kg) (moist, mineral-matter-free) or more than 10,500 Btu/lb (24.4 MJ/kg) if agglomerating (ASTM). It is dark brown to black in color and burns with a smoky flame. Bituminous coal is the most abundant rank of coal; much is Carboniferous in age. CF: medium-volatile bituminous coal; low volatile bituminous coal. Syn: soft coal
    b. A coal that is high in carbonaceous matter, having between 15% and 50% volatile matter. Soft coal. BCI
    c. A general term descriptive of coal other than anthracite and low-volatile coal on the one hand and lignite on the other. BS, 11
    d. A coal with a relatively high proportion of gaseous constituents; dark brown to black in color and burns with a smoky luminous flame. The coke yield ranges from 50% to 90%. The term does not imply that bitumen or mineral pitch is present. See also: coking coal
    Source:
    Dictionary of Mining, Mineral, and Related Terms












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