The following symmetry elements are shown in the figure:

    centre of inversion
    21  screw axis (parallel to c)
    21  screw axis (parallel to a)
    21  screw axis (parallel to b)
    a glide plane (perpendicular to c)
    mirror plane (perpendicular to a)
    n glide plane (shown vertical and perpendicular to b)

© Copyright 1995-2006.  Birkbeck College, University of London. Author(s): Jeremy Karl Cockcroft