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The crystallographic point-group symmetry associated with each space group is given on the top line of the space-group diagrams. There are 32 crystallographic point groups and these are shown in the table below:

Triclinic |
1* |
-1 |
|||||

Monoclinic |
2* |
m* |
2/m |
||||

Orthorhombic |
222 |
mm2* |
mmm |
||||

Tetragonal |
4* |
-4 |
4/m |
422 |
4mm* |
-42m |
4/mmm |

Trigonal |
3* |
-3 |
32 |
3m* |
-3
m |
||

Hexagonal |
6* |
-6 |
6/m |
622 |
6mm* |
-62m |
6/mmm |

Cubic |
23 |
m-3 |
432 |
-43m |
m-3m |

The 11 centrosymmetric point groups are shown in
**red**,
the 11 enantiomorphic point groups are shown in
**green**, and the 10 polar point groups
are shown with an asterisk *****.
(Note that in the above table,
inversion axes are written with a minus sign in front of the axis symbol.)

The symbols for point groups -42*m*, 32, 3*m*, -3*m*, and
-62*m* may be written in alternative forms so as
to indicate symmetry with respect to the unit-cell axes, e.g.
-42*m*, 321, and -31*m*.

© Copyright 1997-1999. Birkbeck College, University of London.