(IUCr) International Union of Crystallography Welcome to theInternational Union of Crystallography The IUCr is an International Scientific Union. Its objectives are to promote international cooperation in crystallography and to contribute to all aspects of crystallography to promote international publication of crystallographic research to facilitate standardization of methods units nomenclatures and symbols and to form a focus for the relations of crystallography to other sciences. Read more Publications Primary research journals reference works and monographs of the highest quality Outreach Crystallography around the world and its growth through education and capacitybuilding initiatives Congress The most important international conference for structural scientists Support Support for conferences workshops Visiting Professorships and more Announcements Sven Lidin Malcolm J. Cooper Itziar Echeverria Montserrat Soler Lopez Francesco Sette Pernille Harris and Leila Lo Leggio We are deeply saddened to share the news of the passing of George Michael Sheldrick.