This process is not responsible for Carbon enrichment. O 2 content, volatile matter, and moisture. This group maceral represents cell walls of trunks, branches, roots, etc. When these macerals are combined together, they comprise specific lithotypes of the coal. Appears like charcoal because it is fossilized charcoal.
Coal breaks with a conchoidal fracture.
Macerals are fine and dominated by exinites, particularly sporinite. The coal is dominated by alginite. Where the residuals of terrestrial plants are not concentrated in a peat, they may occur as viscous impregnations of sandstone, siltstone, shale and carbonate rocks. The chemical constituents of organic matter react to thermal maturation, and there is a change in color of the organic debris with increasing temperature. As the thermal index increases, there is a shift to the red end of the spectrum.