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. 4.3, p. 62

Section 4.3.1. Triclinic system

E. F. Bertauta‡

a Laboratoire de Cristallographie, CNRS, Grenoble, France

4.3.1. Triclinic system

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There are only two triclinic space groups, [P1\;(1)] and [P\bar{1}\;(2)]. P1 is quite outstanding because all its subgroups are also P1. They are listed in Table 13.2.2.1[link] for indices up to [7]. [P\bar{1}] has subgroups [P\bar{1}], isomorphic, and P1, non-isomorphic.

In the triclinic system, a primitive unit cell can always be selected. In some cases, however, it may be advantageous to select a larger cell, with A, B, C, I or F centring.

The two types of reduced bases (reduced cells) are discussed in Section 9.2.2.[link]








































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