International
Tables for
Crystallography
Volume A
Space-group symmetry
Edited by Th. Hahn

© International Union of Crystallography 2006
International Tables for Crystallography (2006). Vol. A. ch. 4.2, p. 61

Section 4.2.2. Additional symmetry elements and extended symbols

E. F. Bertauta‡

a Laboratoire de Cristallographie, CNRS, Grenoble, France

4.2.2. Additional symmetry elements and extended symbols

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`Additional symmetry' elements are

  • (i) rotation points 2, 3 and 4, reproduced in the interior of the cell (cf. Table 4.1.2.1[link] and plane-group diagrams in Part 6[link] );

  • (ii) glide lines g which alternate with mirror lines m.

    In the extended plane-group symbols, only the additional glide lines g are listed: they are due either to c centring or to `inclined' integral translations, as shown in Table 4.1.2.2[link] .








































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