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 may contain up to several weight percent of inorganic elements in microscopically indistinguishable form.
- cutinite - exinite - fusinite - funginite - inertinite - inertodetrinite - liptinite - macrinite - micrinite - resinite - secretinite - semifusinite - sporinite - vitrinite

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

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