Twin element

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Élément de maclage (Fr). Elemento di geminazione (It). 双晶要素 (Ja)


The direct lattice element about which a twin operation is performed. Twins are classified accordingly in:


  • reflection twins, if the twin element is a lattice plane (the twin plane)
  • rotation twins, if the twin element is a lattice direction (the twin axis);
  • inversion twins, if the twin element is an inversion centre (the twin centre).

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See also

Chapter 3.3 of International Tables of Crystallography, Volume D