Description of point groups. In crystallography, point groups usually are described. (i) by means of their Hermann–Mauguin or Schoenflies symbols;. Point group, also called Crystal Class, in crystallography, listing of the ways in which the orientation of a crystal can be changed without seeming to change the. In crystallography, a crystallographic point group is a set of symmetry operations, like rotations or reflections, that leave a central point fixed while moving other directions and faces of the crystal to the positions of features of the same kind. There are infinitely many three-dimensional point groups.Notation · Schoenflies notation · Hermann–Mauguin · The correspondence.
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Occurrence Crystallographic point groups occur: Occurrence Crystallographic point groups occur: Cn for cyclic indicates that the group has an n-fold rotation axis. Cnh is Cn with the addition of a mirror reflection plane perpendicular to the axis of rotation.
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Dnh has, in addition, a mirror plane perpendicular to the n-fold axis. Dnd has, in addition to the elements of Dn, mirror planes parallel to the n-fold axis.