Electron microscopy
 
Pmn21 (31) Space Group
- Practical Electron Microscopy and Database -
- An Online Book -
Microanalysis | EM Book                                                                                   http://www.globalsino.com/EM/        

=================================================================================

 

Table 1656. Pmn21 (31) space group.

Name in the International Tables for Crystallography
Pmn21 P
47 mm2
Crystal system
Orthorhombic mmm
Asymm
0 ≤ x ≤ 1/2 and 0 ≤ y ≤ 1/2 and 0 ≤ z ≤ 1
4 Absence of reflections

Symmetry (atomic coordinates)
X, Y, Z; 1/2-X, -Y, 1/2+Z; 1/2+X, -Y, 1/2+Z; -X, Y, Z
Translation
  Crystal symmetry Is non-centrosymmetric because it has not -x,-y,-z in its symmetry.
Crystal examples
 

 

 

 

=================================================================================