# Difference between revisions of "Twinning (effects of)"

### From Online Dictionary of Crystallography

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= Overlap of lattices = | = 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]]). | + | 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. | [[Twin lattice]], [[twin index]] and [[twin obliquity]] are entries related to the overlap of lattices. | ||

[[Category:Fundamental crystallography]] | [[Category:Fundamental crystallography]] |

## Revision as of 12:57, 16 May 2006

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.