inertinite

n
macerals that exhibit higher reflectance than other organic substances in the coal.
DISCUSSION — In any coal ranked lower than anthracitic, inertinite reflectance commonly spans the range from only slightly higher than associated vitrinite to very high reflectance (often as high as Ro > 6 %). In anthracitic rank coals, inertinite reflectance may be lower than that of vitrinite, and is then recognized by its morphology and form of anisotropy. Highly reflecting inertinite commonly exhibits relief on polished surface. Its name derives from the fact that most varieties behave inertly in the thermoplastic deformation during the coking process (except in its lowest reflecting manifestation). The volatile matter yield of inertinite is lower than that of other macerals in the same coal.

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

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