rotation axis
rotation axis
A symmetry element of the crystallographic point group. When the whole crystal (constituent atoms) is rotated by a certain angle (180°, 120°, 90° or 60°) with respect to a line, the rotated crystal can be equivalent to the crystal before rotation. In this case, this line is called "rotation axis." Corresponding to the respective rotation angles, there exist 2-fold, 3-fold, 4-fold and 6-fold rotation axes.
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