# Difference between revisions of "Twinning by pseudomerohedry"

### From Online Dictionary of Crystallography

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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). | 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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+ | Chapter 3.3 of ''International Tables of Crystallography, Volume D''<br> | ||

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+ | [[Category:Fundamental crystallography]] |

## Revision as of 05:34, 26 April 2006

Maclage par pseudomériédrie (*Fr*). Geminazione per pseudomeroedria(*It*)

# Twinning by pseudomerohedry

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).

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