rotary-inversion axis
rotary-inversion axis
A symmetry element of the crystallographic point group. When the whole crystal (constituent atoms) is rotated by an angle of 90° with respect to a line, and successively an inversion is operated for the rotated crystal, the resultant crystal can be equivalent to the crystal before the operations. In this case, the combination of the two symmetries is called "rotary-inversion axis." Only the 4-fold rotary-inversion axis is a symmetry of the crystallographic point group.
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