The wear of ground-engaging tools in agriculture is affected by various soil properties, including the angularity of the abrasive particles in the soil. In an effort to quantitatively characterize the size and shape of these particles, a new technique has been used. The method is based on a Fourier analysis of the particle profiles. It yields a set of orientation invariant descriptors which quantify the size and shape of these profiles. This technique has been applied to various types of silica sand and crushed quartzite, as well as a few soil samples. The results obtained have shown that this analysis procedure can readily distinguish particles of differing angularities.