Medium-rank inertinite-rich coal samples were collected for study from limnic and paralic facies in the Upper Silesian coal basin of Poland. The microlithotypes seem to control the content of the mosaic textures. It also appears that carbominerites favor the formation of pyrolytic carbons. The coke obtained from poorly pyrofusinitized, homogeneous, limnic coal has higher mechanical strength with larger and thicker cell walls, and is less porous than those derived from highly pyrofusinitized, heterogenous paralic ones. The microstructure of the cokes appears to be controlled by different amounts of fibers and coarse mosaics.