Experimental setting. (a) A schematic of the X-ray single-crystal diffractometer with the sample changer. (b) The powder sample holder, consisting of an acetate strip covered with Kapton tape on both sides. (c) The ruler used to hold the solid samples for measurements. (d) Setup of the sample changer on the SMART APEX diffractometer. For measurements, the sample changer is positioned on top of the ω circle plate. Inset at the bottom: side view of the sample changer loaded with a ruler with 30 hen eggshell samples. Inset at the top: powder sample in oil on a glass filament.