matière de désagrégation humique transparente

CONT: Constituents are the petrographic entities of the attritus that are recognizable in thin sections only by the microscope. The following constituents may be distinguished in coals: translucent humic degradation matter; brown or semitranslucent matter; opaque matter (granular, massive); resins and resinous matter; spores and pollen; cuticles and cuticular matter; algae and algae matter.
CONT: According to the practice at the U.S. [United States] Bureau of Mines, translucent humic degradation matter includes all humic matter less than 14 microns in width perpendicular to the bedding. May be fibrous or in fine bands. Color ranges from orange to red to brownish red ...
OBS: humic degradation matter: Finely comminuted degradation matter in coal largely but not altogether derived from the woody tissues of plants, and like anthraxylon, largely derived from lignin.