Josef Zemann was born on 25 May 1923 in Vienna. Despite the difficult economic conditions of the time, his parents enabled him to attend secondary school. In the autumn of 1941, he began his studies at the University of Vienna, where he soon joined the Institute of Mineralogy. He earned his doctorate under Professor Felix Machatschki in 1946, subsequently worked there as an assistant, and completed his habilitation in 1950.

A Passion for Crystallography and Crystal Chemistry

Inspired by crystallography, Josef Zemann spent the academic year 1951/52 as a visiting researcher at the Massachusetts Institute of Technology (MIT) in Boston, working in the laboratory of Martin J. Buerger, one of the pioneers of modern X-ray crystallography in the geosciences. In 1952, at only 29 years of age, he was appointed Director of the Institute of Mineralogy and Crystallography at the University of Göttingen. In 1967, he accepted the Chair of Mineralogy and Crystallography at the University of Vienna, where he served as Head of the Institute for 22 years until his retirement in 1989.

The publications from his early years in Vienna, Boston, and Göttingen are characterized by the systematic application of X-ray structure analysis to determine the crystal structures and crystal chemistry of a wide variety of minerals. His pioneering studies on the stereochemistry of tellurium(IV)-oxygen compounds were particularly influential. His scientific legacy also includes the calculation of electrostatic lattice energies and infrared spectroscopic investigations of minerals. His work on the stereochemistry of divalent copper in oxide minerals—the so-called Jahn–Teller effect—as well as numerous studies on the crystal chemistry of carbonates, reflects his enduring passion for mineralogical crystallography, which also remained at the heart of his “second Viennese period.”

Awards and Lifelong Dedication to Science

Josef Zemann's enduring scientific curiosity and remarkable, tireless dedication inspired generations of scientists and made him an exceptional role model. His scientific oeuvre comprises more than 180 publications produced over a period of more than half a century (1948–2003), including not only research articles but also widely cited books and book chapters.

The significance of his work was recognized through numerous honors, including the Abraham Gottlob Werner Medal of the German Mineralogical Society, the Erwin Schrödinger Prize, and the Gustav von Tschermak-Seysenegg Prize of the Austrian Academy of Sciences, to name only a few. He was also a member, honorary member, or honorary president of several European mineralogical societies, a Full Member of the Austrian Academy of Sciences, and a member of the German National Academy of Sciences Leopoldina.

Head of the Institute for More Than Two Decades

As Director of the Institute for more than 22 years, Josef Zemann remained deeply committed to his Alma Mater Rudolphina. He was a highly respected academic teacher, a dedicated mentor, and an unwavering supporter of young scientists. He inspired generations of mineralogists and crystallographers through his enthusiasm for science and his relentless intellectual curiosity. Even after his retirement, his extraordinary breadth of knowledge remained an invaluable source of insight for colleagues and students alike.

On the evening of 16 October, Josef Zemann passed away peacefully in his 100th year. His personality, tireless dedication, keen powers of observation, kindness, and sense of humor will be remembered with great affection.

Our thoughts are with his son Josef, his family, and his friends.

Ronald Miletich and Herta Effenberger