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

Name in the International Tables for Crystallography
Cm C
12 m
Crystal system
Monoclinic 2/m
0 ≤ x ≤ 1 and 0 ≤ y ≤ 1/4 and 0 ≤ z ≤ 1


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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