Earthy bauxite (aluminum ore) deposits over limestone bedrock cover over 20 % of Jamaica's surface area. This study focused on documenting micromorphological and mineralogical properties of pre- and post-mined bauxite soils in order to assess pedogenesis and to relate these properties to water and nutrient movement and retention. Pedons were described and sampled at 2 pre-mined sites and 4 post-mined sites near Mandeville, Jamaica. Thin sections were made from air-dry bulk density clods. The mineralogy of representative horizons was evaluated for bulk samples by x-ray diffraction analysis. Sand, silt, and clay fractions were analyzed separately. The micromorphology of bauxite soils in Jamaica was dominated by the expression of very stable, granular, sand to coarse silt-sized microaggregate structure that formed with the oxic horizons. As packing density of microaggregates increased with depth in pre-mined soils, there were fewer and smaller microaggregate packing voids, creating a decrease in porosity, permeability, and water retention at field capacity. Post-mined soils inherited considerable microaggregate structure from pre-mined bauxite, indicating that the microaggregates were very durable. Mineralogy consisted primarily of gibbsite and Al substituted Fe oxides, minerals with negligible net positive charge and high P-fixing capacity. Incorporation of limestone rock fragments increased pH in post-mined soils, but there was little calcite in the clay fraction and no evidence of secondary CaCO₃, suggesting that the calcite may have limited influence on soil solution chemical interactions.