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  1. In the process of coalification, the accumulation of residual carbon by the changes in organic matter and decomposition products. See also: coalification
  2. The accumulation of carbon by the slow, underwater decay of organic matter. AGI
  3. The conversion into carbon of a carbonceous substance such as coal by driving off the other components, either by heat under laboratory conditions or by natural processes. AGI

Source: Dictionary of Mining, Mineral, and Related Terms

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