Principal component analysis was used to reduce eleven soil properties which affect micro aggregate stability to five orthogonal components. The five components together explained 99% of the total variance. Component I which explained 23.4% of the total variance has significant loadings (loadings greater than ±0.70) on aluminium oxide and silica-alumina ratio. Component II explained 20.6 significant loadings on organic carbon and interstratified minerals. Component III explained 20.4% of the total variance and has significant loadings on muscovite and kaolinite. Component IV explained 19.3% of the variance and has significant loadings on calcium carbonate and chlorite while component V explained 15.3% of the variance and has significant loadings on iron oxide. However, when the component defining variables (CDV) were extracted, it was found that aluminium oxide, interstratified minerals, kaolinite, calcium carbonate and iron oxides were the variables with the highest loadings on each component. These are properties related to the mineralogy of the soils suggesting that soil mineralogy is the controlling factor in the stability of these soils at the micro-aggregate level.