International Union of Crystallography
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The International Union of Crystallography (IUCr) is a member of the International Council for Science (ICSU) and exists to serve the world community of crystallographers.
|International Council for Science|
|Website||IUCr Official website|
The IUC notation is the notation for the symmetry group adopted by the International Union of Crystallography in 1952. It names the wallpaper groups with a 4 character name. First it has a P or C for primitive or centered groups. Groups are given a number 1, 2, 3, 4, or 6 for the highest order of symmetry. Groups can have one or two reflections, given as vertical mirrors first (horizontal reflection), and horizontal second (vertical reflection). A simple reflection is given an m (mirror), and a glide-reflection is given a g. Place holder 1 are given for an orthogonal direction with no reflections.
- "Ralph W. G. Wyckoff 1897-1994," Acta Crystallogr. (1995). A51, 649-650. Accessed online at http://ww1.iucr.org/people/wyckoff.htm on 3/23/2010