carbon form

n
as used in Test Method D5061, microscopically distinguishable carbonaceous textural components of coke, but excluding mineral carbonates.
DISCUSSION — Carbon forms are recognized on the basis of their reflectance, anisotropy, and morphology. They are derived from the organic portion of coal and can be anisotropic or isotropic. D5061

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

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