Electron microscopy
  
Cm (8) Space Group
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Table 1671. Cm (8) space group.

Name in the International Tables for Crystallography
 Cm
Lattice type
 C
Patterson space group
 12
Point group
 m
Crystal system
 Monoclinic
Laue class
 2/m
Asymm
 0 ≤ x ≤ 1 and 0 ≤ y ≤ 1/4 and 0 ≤ z ≤ 1
Number of symmetry operators
 4  

 
Translation
  
Symmetry (atomic coordinates)
X, Y, Z; X, -Y, Z; 1/2+X, 1/2+Y, Z; 1/2+X, 1/2-Y, Z
Forbidden reflections
 The three space groups C2/m, C2 and Cm have the same systematic forbidden reflections which are caused by the C-centering (h+k = 2n+1). The other symmetry operations in the three space groups, e.g. 2-fold rotation axis (2) and mirror plane (m) in the C2/m space group, do not cause forbidden reflections.
Crystal examples
  

 

 

 
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