See p. 72 in Buol et al. Soil thin sections have thickness of 30 m. Skeleton grains can weather to form plasma. Plasma is the potentially mobile part of soil material. Soil fabric - physical constitution of a soil material as expressed by the arrangement of solid particles and associated voids.
Channels sometimes occur without chambers.
It does not include pedological features. Pedological features - units distinguished from the associated soil materials and that have formed as a result of specific soil forming processes. Same as siltans. They are not true coatings. Pedotubules - channels created by plants or animals which were backfilled with soil material, often from other horizons.