Electron microscopy
 
mm2 Point Group
- Practical Electron Microscopy and Database -
- An Online Book -
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This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.
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Point group mm2 belongs to orthorhombic lattices (see Table 2980). As indicated in page1592, mm2 denotes mirrors normal to x and y axes with a two-fold axis along z axis.

Table 2980. All space groups which have point group mm2.
Space Group Patterson Space Group Number of Symmetry Operators Crystal System Laue Class Lattice Type
Pmm2 47 4 Orthorhombic mmm P
Pmc21 47 4 Orthorhombic mmm P
Pcc2 47 4 Orthorhombic mmm P
Pma2 47 4 Orthorhombic mmm P
Pca21 47 4 Orthorhombic mmm P
Pnc2 47 4 Orthorhombic mmm P
Pmn21 47 4 Orthorhombic mmm P
Pba2 47 4 Orthorhombic mmm P
Pna21 47 4 Orthorhombic mmm P
Pnn2 47 4 Orthorhombic mmm P
Cmm2 65 8 Orthorhombic mmm C
Cmc21 65 8 Orthorhombic mmm C
Ccc2 65 8 Orthorhombic mmm C
Amm2 65 8 Orthorhombic mmm A
Abm2 65 8 Orthorhombic mmm A
Ama2 65 8 Orthorhombic mmm A
Aba2 65 8 Orthorhombic mmm A
Fmm2 69 16 Orthorhombic mmm F
Fdd2 69 16 Orthorhombic mmm F
Imm2 71 8 Orthorhombic mmm I
Iba2 71 8 Orthorhombic mmm I
Ima2 71 8 Orthorhombic mmm I

 

 

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