I have some precipitate samples that I wish to analyze for XRD. I collected them by filtration of a slurry. Through the filtration, the precipitates "cemented" on the surface of the filter pad so the samples I collected are not exactly in powdered form, which I believe is the ideal form to do XRD analysis. I have read that in such cases, pulverization can be achieved using mortar and pestle. However, I worry that this might affect the crystallinity of the precipitates, which is the most important characteristic that I wish to analyze. Can somebody suggest a method to achieve pulverization without affecting (or at least minimizing) the effect on crystallinity? Or if I am to use mortar and pestle, is there an additional step that should be taken to avoid errors? Thank you so much!