Figure 3.3.4.2

Hahn, Th.; Klapper, H.

doi:10.1107/97809553602060000644

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. 3.3, p. 400

Figure 3.3.4.2

Th. Hahn^a ^* and H. Klapper^b

^a Institut für Kristallographie, Rheinisch–Westfälische Technische Hochschule, D-52056 Aachen, Germany, and ^bMineralogisch-Petrologisches Institut, Universität Bonn, D-53113 Bonn, Germany
Correspondence e-mail: hahn@xtal.rwth-aachen.de

Figure 3.3.4.2

Twinning of an orthorhombic crystal with equivalent twin mirror planes (110) and $[({\bar 1}10)]$ . Three twin domains 1, 2 and 3, bound by {110} contact planes, are shown. The oriented eigensymmetries $[{\cal H}_1]$ , $[{\cal H}_2]$ , $[{\cal H}_3]$ and the reduced composite symmetries $[{\cal K}^\star (1,2) = {\cal K}^\star (110)]$ and $[{\cal K}^\star (1,3) = {\cal K}^\star({\bar 1}10)]$ of each domain pair are given in stereographic projection. The intersection symmetry of all domains is $[{\cal H}^\star = 112/m]$ .