1. Metamorphosed bituminous coal of about 95 to 98 percent carbon.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
     
  2. a. A hard, black lustrous coal containing a high percentage of fixed carbon and a low percentage of volatile matter. Commonly referred to as hard coal, it is mined in the United States, mainly in eastern Pennsylvania, although in small quantities in other States. BCI
    b. The rank of coal, within the anthracitic class of Classification D 388, such that on the dry and mineral-matter-free basis, the volatile matter content of the coal is greater than 2% but equal to or less than 8% (or the fixed carbon content is equal to or greater than 92% but less than 98%), and the coal is nonagglomerating. ASTM
    c. Coal of the highest metamorphic rank, in which fixed-carbon content is between 92% and 98% (on a dry, mineral-matter-free basis). It is hard and black, and has a semimetallic luster and semiconchoidal fracture. Anthracite ignites with difficulty and burns with a short blue flame, without smoke. Syn: hard coal; stone coal; kilkenny coal. See also: solid smokeless fuel
    Source:
    Dictionary of Mining, Mineral, and Related Terms











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