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

International Tables for Crystallography (2006). Vol. A, ch. 2.2, p. 39


Th. Hahna* and A. Looijenga-Vosb

aInstitut für Kristallographie, Rheinisch-Westfälische Technische Hochschule, Aachen, Germany, and bLaboratorium voor Chemische Fysica, Rijksuniversiteit Groningen, The Netherlands
Correspondence e-mail:

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Monoclinic setting symbols (unique axis is underlined)

Unique axis bUnique axis cUnique axis a 
[Scheme scheme1] [{\bf c}{\underline{\bar{\bf b}}}{\bf a}] [{\bf c}{\bf a}\underline{\bf b}] [{\bf a}{\bf c}\underline{\bar{\bf b}}] [{\underline{\bf b}{\bf c}{\bf a}}] [{\underline{\bar{\bf b}}{\bf a}{\bf c}}] [Scheme scheme4]
[{{\bf b}\underline{\bf c}{\bf a}}] [{{\bf a}\underline{\bar{\bf c}}{\bf b}}] [Scheme scheme2] [{{\bf b}{\bf a}\underline{\bar{\bf c}}}] [{\underline{\bf c}{\bf a}{\bf b}}] [{\underline{\bar{\bf c}}{\bf b}{\bf a}}] [Scheme scheme5]
[{{\bf c}\underline{\bf a}{\bf b}}] [{{\bf b}\underline{\bar{\bf a}}{\bf c}}] [{{\bf b}{\bf c}\underline{\bf a}}] [{{\bf c}{\bf b}\underline{\bar{\bf a}}}] [Scheme scheme3] [{\underline{\bar{\bf a}}{\bf c}{\bf b}}] [Scheme scheme6]

Note: An interchange of two axes involves a change of the handedness of the coordinate system. In order to keep the system right-handed, one sign reversal is necessary.