impure coal

impure coal
coal having 25 weight % or more, but less than 50 weight %, of ash on the dry basis.
DISCUSSION — Bone coal with more than 50 weight % ash is properly called coaly or carbonaceous shale or siltstone. Types of impure coal other than bone coal and mineralized coal sometimes occur, for example, sandy coal.

ASTM D121-09a Standard Terminology of Coal and Coke. 2014.

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