an inertinite maceral with morphology like fusinite sometimes with less distinct evidence of cellular structure, but with reflectance ranging from slightly greater than that of associated vitrinite to some value intermediate to that of the brightest fusinite. The particle size is also greater than 50 µm except when it occurs as a fragment within the binder matrix.
DISCUSSION — The precise reflectance boundary between semifusinite and fusinite has not been universally defined, although some practitioners place the division at Ro = 2.0 %; hence, semifusinite is somewhat vaguely defined as “fusinite with low reflectance.”

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

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