Twinning by pseudomerohedry

From Online Dictionary of Crystallography

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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).