Trigonal system

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

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International Tables for Crystallography (2006). Vol. D. ch. 1.1, p. 25

Section 1.1.4.10.4.4. Trigonal system

A. Authier^a ^*

^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

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(i) Group 3: where the symbol ⊖ means that the corresponding component is equal to the opposite of that to which it is linked, ⊙ means that the component is equal to twice minus the value of the component to which it is linked for $[d_{ijk}]$ and to minus the value of the component to which it is linked for $[e_{ijk}]$ . There are 6 independent components.
(ii) Group 32, twofold axis parallel to $[Ox_{1}]$ : with the same conventions. There are 4 independent components.
(iii) Group , mirror perpendicular to $[Ox_{1}]$ : with the same conventions. There are 4 independent components.
(iv) Groups $[\bar{3}]$ and $[\bar{3}m]$ : all the components are equal to zero.

International Tables for Crystallography (2006). Vol. D. ch. 1.1, p. 25