Zdeněk Johan, an outstanding Czech-French mineralogist and a great colleague, passed away in February 2016. He served as Scientific Director of the French Bureau de Recherches Géologiques et Minières (BRGM), became a fellow of professional and learned societies and received numerous honours and distinctions for his scientific achievements in mineralogy, crystal chemistry, petrology and ore geology (see Ettler, 2016). He also served in 1993 as president of the Société française de Minéralogie et de Cristallographie (SFMC), a founding society of the European Journal of Mineralogy (EJM). When asked by the Editorial Board, we thus immediately agreed to organize...
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