International
Tables for Crystallography Volume A1 Symmetry relations between space groups Edited by Hans Wondratschek and Ulrich Müller © International Union of Crystallography 2006 |
International Tables for Crystallography (2006). Vol. A1. ch. 3.1, p. 429
Section 3.1.1.6.2. Subgroup symbol
a
Fachbereich Chemie, Philipps-Universität, D-35032 Marburg, Germany |
The index is followed by the Hermann–Mauguin symbol (short symbol) and the space-group number of the subgroup. If a nonconventional setting has been chosen, then the space-group symbol of the conventional setting is also mentioned in the following line after the symbol .
In some cases of nonconventional settings, the space-group symbol does not show uniquely in which manner it deviates from the conventional setting. For example, the nonconventional setting of the space group can result from cyclic exchange of the axes, or by interchange of b with c . As a consequence, the relations between the Wyckoff positions can be different. In such cases, cyclic exchange has always been chosen.