 He was the author of a well-received textbook on mineralogy, ""Lehrbuch der Mineralogie"", that was published over numerous editions.From the 11th edition (1936) onward, publication of the textbook was continued by Paul Ramdohr.The mineral klockmannite commemorates his name, as does "Klockmannfjellet", a mountain (939m) located in the central part of Wedel Jarlsberg Land, Spitsbergen.