Origin at centre (-3m1)
Asymmetric unit | 0 ≤ x; 0 ≤ y; 0 ≤ z ≤ 1; y ≤ x/2 |
(1) 1 | (2) 3+ 0, 0, z | (3) 3- 0, 0, z |
(4) 2 x, x, 0 | (5) 2 x, 0, 0 | (6) 2 0, y, 0 |
(7) -1 0, 0, 0 | (8) -3+ 0, 0, z; 0, 0, 0 | (9) -3- 0, 0, z; 0, 0, 0 |
(10) m x, -x, z | (11) m x, 2x, z | (12) m 2x, x, z |
Generators selected (1); t(0, 0, 1); (2); (4); (7)
Multiplicity, Wyckoff letter, Site symmetry | Coordinates | Reflection conditions |
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| | General:
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| (1) x, y, z | (2) -y, x - y, z | (3) -x + y, -x, z | (4) y, x, -z | (5) x - y, -y, -z | (6) -x, -x + y, -z | (7) -x, -y, -z | (8) y, -x + y, -z | (9) x - y, x, -z | (10) -y, -x, z | (11) -x + y, y, z | (12) x, x - y, z |
| no conditions |
| | Special: no extra conditions |
| x, -x, z | x, 2x, z | -(2x), -x, z | -x, x, -z | 2x, x, -z | -x, -(2x), -z |
| |
| x, 0, 1/2 | 0, x, 1/2 | -x, -x, 1/2 | -x, 0, 1/2 | 0, -x, 1/2 | x, x, 1/2 |
| |
| x, 0, 0 | 0, x, 0 | -x, -x, 0 | -x, 0, 0 | 0, -x, 0 | x, x, 0 |
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Symmetry of special projections
Along [001] 6mm
Origin at 0, 0, z | Along [100] 211 a' = c Origin at x, 0, 0 | Along [210] 2mm a' = c Origin at x, 1/2x, 0 |
Maximal non-isotypic non-enantiomorphic subgroups
I | [2] 3m1 (49) | 1; 2; 3; 10; 11; 12 |
| [2] 321 (312, 46) | 1; 2; 3; 4; 5; 6 |
| [2] -311 (-3, 45) | 1; 2; 3; 7; 8; 9 |
| [3] 12/m1 (2/m11, 6) | 1; 4; 7; 10 |
| [3] 12/m1 (2/m11, 6) | 1; 5; 7; 11 |
| [3] 12/m1 (2/m11, 6) | 1; 6; 7; 12 |
IIb | [2] -3c1 (c' = 2c) (-31c, 52) |
Maximal isotypic subgroups and enantiomorphic subgroups of lowest index
IIc | [2] -3m1 (c' = 2c) (-31m, 51) |
Minimal non-isotypic non-enantiomorphic supergroups
I | [2] 6/mmm (73); [2] 63/mmc (75) |