Origin at centre (2/m)
| Asymmetric unit | 0 ≤ x ≤ 1/2; 0 ≤ y ≤ 1/2; 0 ≤ z ≤ 1/2 |
| (1) 1 | (2) 2 0, 0, z | (3) 2(0, 1/2, 0) 1/4, y, 1/4 | (4) 2(1/2, 0, 0) x, 1/4, 1/4 |
| (5) -1 0, 0, 0 | (6) m x, y, 0 | (7) n(1/2, 0, 1/2) x, 1/4, z | (8) n(0, 1/2, 1/2) 1/4, y, z |
Generators selected (1); t(1, 0, 0); t(0, 1, 0); t(0, 0, 1); (2); (3); (5)
Multiplicity, Wyckoff letter,
Site symmetry | Coordinates | Reflection conditions |
| | | General:
|
| | (1) x, y, z | (2) -x, -y, z | (3) -x + 1/2, y + 1/2, -z + 1/2 | (4) x + 1/2, -y + 1/2, -z + 1/2 | | (5) -x, -y, -z | (6) x, y, -z | (7) x + 1/2, -y + 1/2, z + 1/2 | (8) -x + 1/2, y + 1/2, z + 1/2 |
| 0kl : k + l = 2n
h0l : h + l = 2n
h00 : h = 2n
0k0 : k = 2n
00l : l = 2n
|
| | | Special: as above, plus
|
| | x, y, 0 | -x, -y, 0 | -x + 1/2, y + 1/2, 1/2 | x + 1/2, -y + 1/2, 1/2 |
| no extra conditions |
| | 0, 1/2, z | 1/2, 0, -z + 1/2 | 0, 1/2, -z | 1/2, 0, z + 1/2 |
| hkl : h + k + l = 2n
|
| | 0, 0, z | 1/2, 1/2, -z + 1/2 | 0, 0, -z | 1/2, 1/2, z + 1/2 |
| hkl : h + k + l = 2n
|
| | hkl : h + k + l = 2n
|
| | hkl : h + k + l = 2n
|
| | hkl : h + k + l = 2n
|
| | hkl : h + k + l = 2n
|
Symmetry of special projections
Along [001] p2gg
a' = a b' = b
Origin at 0, 0, z | Along [100] c2mm
a' = b b' = c
Origin at x, 0, 0 | Along [010] c2mm
a' = c b' = a
Origin at 0, y, 0 |
Maximal non-isomorphic subgroups
| I | | [2] Pnn2 (34) | 1; 2; 7; 8 |
| | | [2] Pn21m (Pmn21, 31) | 1; 3; 6; 8 |
| | | [2] P21nm (Pmn21, 31) | 1; 4; 6; 7 |
| | | [2] P21212 (18) | 1; 2; 3; 4 |
| | | [2] P121/n1 (P21/c, 14) | 1; 3; 5; 7 |
| | | [2] P21/n11 (P21/c, 14) | 1; 4; 5; 8 |
| | | [2] P112/m (P2/m, 10) | 1; 2; 5; 6 |
Maximal isomorphic subgroups of lowest index
| IIc | [3] Pnnm (a' = 3a or b' = 3b) (58); [3] Pnnm (c' = 3c) (58) |
Minimal non-isomorphic supergroups
| I | [2] P4/mnc (128); [2] P42/mnm (136) |
| II | [2] Amam (Cmcm, 63); [2] Bbmm (Cmcm, 63); [2] Cccm (66); [2] Immm (71); [2] Pncm (a' = 1/2a) (Pmna, 53); [2] Pcnm (b' = 1/2b) (Pmna, 53); [2] Pbam (c' = 1/2c) (55) |
