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

### From Online Dictionary of Crystallography

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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]]). | ||

Related to the overlap of lattices [[twin lattice]], [[twin index]] and [[twin obliquity]] are defined. | Related to the overlap of lattices [[twin lattice]], [[twin index]] and [[twin obliquity]] are defined. | ||

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+ | [[Category:Fundamental crystallography]] |

## Revision as of 09:48, 26 April 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). Related to the overlap of lattices twin lattice, twin index and twin obliquity are defined.