# Difference between revisions of "Twinning by pseudomerohedry"

### From Online Dictionary of Crystallography

BrianMcMahon (talk | contribs) (Tidied translations and added German (U. Mueller)) |
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− | A lattice is said to be pseudosymmetric if at least a lattice row or/and a lattice plane approximately correspond to elements | + | A lattice is said to be pseudosymmetric if at least a lattice row or/and a lattice plane approximately correspond to symmetry elements for the lattice; these elements can act as twin elements (''e.g.'' a monoclinic lattice with its oblique angle ''close'' to 90° is pseudo-orthorhombic and thus shows two pseudo twofold axes and two pseudo mirror planes). |

== See also == | == See also == |

## Latest revision as of 14:59, 15 April 2021

Maclage par pseudomériédrie (*Fr*). Pseudomeroedrische Verzwillingung (*Ge*). Geminazione per pseudomeroedria (*It*). 擬欠面双晶 (*Ja*). Macla por seudomeroedría (*Sp*).

A lattice is said to be pseudosymmetric if at least a lattice row or/and a lattice plane approximately correspond to symmetry elements for the lattice; these elements can act as twin elements (*e.g.* a monoclinic lattice with its oblique angle *close* to 90° is pseudo-orthorhombic and thus shows two pseudo twofold axes and two pseudo mirror planes).

## See also

- Chapter 3.3 of
*International Tables for Crystallography, Volume D*