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

International Tables for Crystallography (2006). Vol. A, ch. 4.3, p. 62

Section 4.3.1. Triclinic system

E. F. Bertauta

aLaboratoire 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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