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

International Tables for Crystallography (2006). Vol. D, ch. 1.1, p. 20

Section Triclinic system (groups [{\bar 1}], [1])

A. Authiera*

aInstitut de Minéralogie et de la Physique des Milieux Condensés, Bâtiment 7, 140 rue de Lourmel, 75015 Paris, France
Correspondence e-mail: Triclinic system (groups [{\bar 1}], [1])

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There is no reduction; all the components are independent. Their number is equal to 81. They are usually represented as a [9\times 9] matrix, where components [t_{ijkl}] are replaced by ijkl, for brevity: [Scheme scheme102] This matrix can be represented symbolically by [Scheme scheme33] where the [9\times 9] matrix has been subdivided for clarity in to nine [3\times 3] submatrices.

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