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The members of the inertinite group are considered to be equivalent of charcoal and degraded plant material and originate from plant material, usually woody tissues, plant degradation products, or fungal remains. Inertinite macerals are characterized by high reflectance, as well as a distinct cell texture and are highly oxidized in nature with a high inherent carbon content that resulted from thermal or biological oxidation.

The inertinite group comprises the macerals (i) fusinite, (ii) semi-fusinite, (iii) macrinite, (iv) micrinite, (v) inertodetrinite, and (vi) scleronite. Fusinite originates from the oxidation of cellular woody tissues and they occur in varying quantities in peat, lignite and bituminous coals. Semi-fusinite is characterized by high reflectance and they are derived from cellular woody tissue as well. Inertodetrinite is derived from oxidized cell-wall fragments and they have reflectance that varies within broad limits, their reflectance being slightly higher than that of vitrinite and liptinite. They can almost be classified as non-reactive during carbonization and produces less volatile products during pyrolsis.