Laue classes
From Online Dictionary of Crystallography
Classes de Laue (Fr). Laue Klassen (Ge). Clases de Laue (Sp). Classi di Laue (It)
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Definition
The Laue classes correspond to the eleven centrosymmetric crystallographic point groups. When absorption is negligible and Friedel's law applies, it is impossible to distinguish by diffraction between a centrosymmetric point group and one of its non-centrosymmetric subgroups.
| Laue classes | Non-centrosymmetric groups having the same Laue class |
 | 1 |
| 2/m | 2, m |
| mmm | 222, 2mm |
 | 3 |
 | 32, 3m |
| 4/m | 4, 
|
| 4/mmm | 422,  , 42m
|
| 6/m | 6, 
|
| 6/mmm | 622,  , 62m
|
 | 23 |
 | 432, 32
|
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See also
Chapter 3.1 of International Tables of Crystallography, Section A
Chapter 2.4 of International Tables of Crystallography, Section D
