Abstract. Aggregation affects a wide range of physical and biogeochemical soil properties with positive effects on carbon storage. For weathered tropical soils, aluminous clays (kaolinite gibbsite) pedogenic Fe (oxyhydr)oxides (goethite hematite; termed “Fe oxides”) have been suggested as important building units for aggregates. However, aluminosilicates, aluminum hydroxides, oxides are part th...