caption: The image shows a group of three pieces of rock sitting on top of a table, with papers containing text and a QR code scattered around them. The papers appear to be from the National Naturhistorisch Museum in Leiden, as indicated by the text on the papers. The rocks are arranged in a triangular formation, with the largest rock in the center and the two smaller stones on either side. The QR code is located at the bottom right corner of the table.