Chapter/Index: Introduction | A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
Appendix
Cm (8) Space Group
| Table 1671. Cm (8) space group.
Name in the International Tables for Crystallography |
Cm |
|
C |
|
12 |
|
m |
Crystal system |
Monoclinic |
|
2/m |
Asymm |
0 ≤ x ≤ 1 and 0 ≤ y ≤ 1/4 and 0 ≤ z ≤ 1 |
|
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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