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

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

aLaboratoire 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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