# Twinning by reticular polyholohedry

### From Online Dictionary of Crystallography

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- | <Font color="blue"> Maclage par polyholoédrie | + | <Font color="blue"> Maclage par polyholoédrie réticulaire</Font> (''Fr'') <Font color="black"> Geminazione per polioloedria reticolare </Font>(''It'') |

Twinning by '''reticular polyholohedry''' is a special case of [[twinning by reticular merohedry]] that occurs when the [[twin lattice]] has the same point group as the lattice of the individual but at least one of its symmetry elements is differently oriented in space. | Twinning by '''reticular polyholohedry''' is a special case of [[twinning by reticular merohedry]] that occurs when the [[twin lattice]] has the same point group as the lattice of the individual but at least one of its symmetry elements is differently oriented in space. | ||

When the point group of the [[twin lattice]] is only close to that of the individual lattice one speaks of '''twinning by reticular pseudopolyholohedry''', which corresponds to non-zero [[twin obliquity]]. | When the point group of the [[twin lattice]] is only close to that of the individual lattice one speaks of '''twinning by reticular pseudopolyholohedry''', which corresponds to non-zero [[twin obliquity]]. |

## Revision as of 11:03, 7 May 2006

Maclage par polyholoédrie réticulaire (*Fr*) Geminazione per polioloedria reticolare (*It*)

Twinning by **reticular polyholohedry** is a special case of twinning by reticular merohedry that occurs when the twin lattice has the same point group as the lattice of the individual but at least one of its symmetry elements is differently oriented in space.

When the point group of the twin lattice is only close to that of the individual lattice one speaks of **twinning by reticular pseudopolyholohedry**, which corresponds to non-zero twin obliquity.