U.S. Geological Survey: Science for a Changing World - USGS visiaul identifier and link to main Web site at http://www.usgs.gov/

Diagram showing classification of coals by rank in the
      U.S. For a mpre detailed explanation, contact Stanley Schweinfurth at sschwein@usgs.gov

Figure 17. Diagram showing classification of coals by rank in the U.S. Rank is a measure of the progressive alteration in the series from lignite to anthracite. Higher rank coals are generally harder, contain less moisture and volatile matter, and have higher calorific values. Modified from Trumbull (1960). For a more detailed explanation of coal rank determination, see ASTM International (2002).


U.S. Department of the Interior, U.S. Geological Survey
URL: https:// pubs.usgs.gov /circ/c1143/html/fig17.html
For more information, contact Stanley Schweinfurth
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