Pedal soil shapes include granular, columnar, or blocky forms. Classification of peds depends on the system.
According to Food and Agricultural Organizatiuon (FAO) system the structure can be: blocky, granular, platy, prismatic, rock structure, wedge-shaped (Elliptical, interlocking lenses that terminate in sharp angles, bounded by slickensides; not limited to vertic materials.) and rumbs, lumps and clods.
Soil structure types and their formation (Guidelines for Soil Description, fourth edition, FAO, Rome, 2006)