A K-feldspar sample was obtained from the Pacific Museum of Earth, University of British Columbia. The K-feldspar was ground into a powder using a mortar and pestle. The mineralogy of the resulting powder was 85% microcline (KAlSi3O8) and 15% albite (NaAlSi3O8) as determined by X-ray diffraction measurements. The particle sizes were around 3 μm based on the specific surface area of the particles in the powder determined with the Brunauer-Emmett-Teller nitrogen adsorption method