Click on any of the three buttons on the right side of the figure to operate one of the symmetry classes of the monoclinic crystal system on a face pole in stereographic projection. The three classes have a 2-fold axis, a mirror plane and  a 2-fold axis perpendicular to a mirror plane, respectively.

A click on the circle will clear the figure and select a new face pole.

Exercise

1) What is the orientation of the mirror plane related to the North-South axis of the reflection sphere?

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Presentation