As mentioned above, in 1994 I moved to Cologne to take a position as professor of mineralogy and geochemistry at the University of Cologne. I have described some of my activities in Cologne in the preceding sections of this paper.
My colleagues at Cologne were H.-A. Seck, Eberhard Seidel and Werner Rammensee and in the neighbouring Institute of Crystallography there were Ladislav Bohatý and Manfred Mühlberg. Initially my teaching obligations were for students at an advanced level. Later after the retirement of Hans Seck I had to teach beginners. Since I never studied mineralogy at a university I had to...
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