- nan inertinite maceral occurring as round, ovoid, or oblong bodies, without obvious plant structure, vesicled to non-vesicled, sometimes containing characteristic fractures, slits, or a notch.DISCUSSION — Secretinite is considered to be derived by the oxidation of plant resin secretions or humic gels. Vesicular and non-vesicular secretinite was formerly included in sclerotinite of fungal origin. Secretinite is a common maceral in medium-and high-rank Permian and Carboniferous coals
ASTM D121-09a Standard Terminology of Coal and Coke. 2014.
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maceral — n an organic substance in coal that is distinguished and classified on the basis of its optical microscopic properties. DISCUSSION Macerals originate from plant tissues, secretions, and exudates that have been altered by geological processes and… … Coke&Coal Terminology