Prof. Dr. Horst Küppers (*April 24, 1933) passed away on May 9, 2025.
Prof. Küppers taught crystal physics at the Mineralogical-Petrographical Institute of the Christian-Albrechts University of Kiel from 1975 until his retirement in 1998. In addition to his scientific contributions, he undertook the documentation of the history of mineralogy in Kiel. We in particular wish to commemorate his many years of service to the German Society for Crystallography, whose treasurer he was from 1991 to 2003.