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Difference between revisions of "Twinning by pseudomerohedry"

From Online Dictionary of Crystallography

(Tidied translations and added German (U. Mueller))
(slight reformulation (element, not operator)
 
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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 of symmetry; these elements can act as twinning operators (''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).
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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 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