mm2 point group

mm2 Point Group
- Practical Electron Microscopy and Database -
- An Online Book -

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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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