International
Tables for
Crystallography
Volume D
Physical properties of crystals
Edited by A. Authier

© International Union of Crystallography 2006
International Tables for Crystallography (2006). Vol. D. ch. 1.1, p. 18

Section 1.1.4.8.4. Trigonal system

A. Authiera*

a Institut de Minéralogie et de la Physique des Milieux Condensés, Bâtiment 7, 140 rue de Lourmel, 75015 Paris, France
Correspondence e-mail: aauthier@wanadoo.fr

1.1.4.8.4. Trigonal system

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1.1.4.8.4.1. Group [3]

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The threefold axis is parallel to [Ox_{3}]. The matrix method should be used here. One finds [Scheme scheme19]

There are 9 independent components.

1.1.4.8.4.2. Group [32] with a twofold axis parallel to [Ox_{1}]

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[Scheme scheme20]

There are 4 independent components.

1.1.4.8.4.3. Group [3m] with a mirror normal to [Ox_{1}]

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[Scheme scheme21]

There are 4 independent components.

1.1.4.8.4.4. Groups [\bar{3}] and [\bar{3}m]

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All the components are equal to zero.








































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