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Reactive surface area is an important control on the rates of interfacial processes occurring between minerals and aqueous solutions with direct implications to reactive transport modelling.Contrast in 3D CT imaging is based on differences in molecular mass and bulk density.The minerals K-feldspar,quartz and kaolinite which are similar in composition and density are currently the limit of the 3D CT imaging.We found that the use of dual-energy micro-tomography does not currently identify more minerals than the current single energy method due to insufficient signal over noise.However,this technique may provide an important practical advantage.Because in the dual-energy technique,the lowest energy is higher than in single-energy,that means the x-ray penetration increases,and the maximum sample size can possibly be increased 3 to 4 fold from 2mm to 6 to 8mm.This will allow mineral identification to be applied directly to reactive flow samples,instead of simply dry characterisation.Finally,there is potential for more nuanced characterisation based on density and molecular mass information,not available using single-energy imaging.