You clicked on one of the short space-group symbols listed below:
P -1 | For triclinic space groups the short and long forms of the space group symbol are identical. |
P 21/c
and C 2/c |
For monoclinic space groups, the short form of the space-group symbol does not indicate which is the unique axis: Although the standard setting for monoclinic space groups is with the unique axis parallel to b, the short space group is not unique when non-standard settings of the unit cell are taken into account. The short form of the space-group symbol should be contrasted with the completely unambiguous full form. |
P 21 21 21 | For this non-centrosymmetric orthorhombic space group the short and long forms of the space-group symbol are identical. Note that centrosymmetric orthorhombic space groups have both axes and planes, with only the planes being specified in the short form of the space-group symbol. |
P n m a | By contrast, centrosymmetric orthorhombic space group, such as the one shown on the left, have both long and short forms. The full form shows the axes, which can be derived from a knowledge of the three planes given in the space group symbol. |
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© Copyright 1995-2006. Birkbeck College, University of London. | Author(s): Jeremy Karl Cockcroft |