meta-anthracite

n
the rank of coal, within the anthracite class of Classification D388, such that, on the dry and mineral-matter-free basis, the volatile matter content of the coal is equal to or less than 2 % (or the fixed carbon is equal to or greater than 98 %), and the coal is nonagglomerating.

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

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