Twinning (effects of)
From Online Dictionary of Crystallography
Revision as of 13:22, 16 May 2006 by MassimoNespolo (Fr)
Maclage (effets de) (Fr) Geminazione (effetti della) (It)
Overlap of lattices
By effect of a twinning operation, both the direct and reciprocal lattice of the individuals forming a twin are overlapped. Overlapping (restoration) of nodes belonging to different individuals can be: (i) exact and total (twinning by merohedry); (ii) exact but partial (i.e. only a fraction of the nodes of an individual lattice is restored; twinning by reticular merohedry); (iii) total but approximate (twinning by pseudomerohedry), approximate and partial (twinning by reticular pseudomerohedry). Twin lattice, twin index and twin obliquity are entries related to the overlap of lattices.