HermannMauguin/International Notations for Symmetry Elements  Practical Electron Microscopy and Database   An Online Book  

Microanalysis  EM Book http://www.globalsino.com/EM/  


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In crystallography and geometry, Hermann–Mauguin notation has been used to describe the symmetry elements in point groups, plane groups and space groups. It was named after the German crystallographer Carl Hermann because he introduced it in 1928 and the French mineralogist CharlesVictor Mauguin because he modified it in 1931. The Hermann–Mauguin notation, compared with the Schoenflies notation, is preferred in crystallography because it includes translational symmetry elements (glide planes and screwaxis) and specifies the directions of the symmetry axes. This notation is often called international notation because it has been used as standard by the International Tables For Crystallography since the first edition in 1935. Some conventional rules for describing the symmetry elements have been applied in Hermann–Mauguin notation:


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