
Origin at -6 m 2
Asymmetric unit | 0 ≤ x ≤ 2/3; 0 ≤ y ≤ 2/3; 0 ≤ z ≤ 1/2; x ≤ 2y; y ≤ min(1 - x, 2x) |
Vertices | 0, 0, 0 | 2/3, 1/3, 0 | 1/3, 2/3, 0 | 0, 0, 1/2 | 2/3, 1/3, 1/2 | 1/3, 2/3, 1/2 |
|
(1) 1 | (2) 3+ 0, 0, z | (3) 3- 0, 0, z |
(4) m x, y, 0 | (5) -6- 0, 0, z; 0, 0, 0 | (6) -6+ 0, 0, z; 0, 0, 0 |
(7) m x, -x, z | (8) m x, 2x, z | (9) m 2x, x, z |
(10) 2 x, -x, 0 | (11) 2 x, 2x, 0 | (12) 2 2x, x, 0 |
Generators selected (1); t(1, 0, 0); t(0, 1, 0); t(0, 0, 1); (2); (4); (7)
Multiplicity, Wyckoff letter, Site symmetry | Coordinates | Reflection conditions |
| | General:
|
| (1) x, y, z | (2) -y, x - y, z | (3) -x + y, -x, z | (4) x, y, -z | (5) -y, x - y, -z | (6) -x + y, -x, -z | (7) -y, -x, z | (8) -x + y, y, z | (9) x, x - y, z | (10) -y, -x, -z | (11) -x + y, y, -z | (12) x, x - y, -z |
| no conditions |
| | Special: as above, plus
|
| x, -x, z | x, 2x, z | (-2x), -x, z | x, -x, -z | x, 2x, -z | (-2x), -x, -z |
| no extra conditions |
| x, y, 1/2 | -y, x - y, 1/2 | -x + y, -x, 1/2 | -y, -x, 1/2 | -x + y, y, 1/2 | x, x - y, 1/2 |
| no extra conditions |
| x, y, 0 | -y, x - y, 0 | -x + y, -x, 0 | -y, -x, 0 | -x + y, y, 0 | x, x - y, 0 |
| no extra conditions |
| x, -x, 1/2 | x, 2x, 1/2 | (-2x), -x, 1/2 |
| no extra conditions |
| x, -x, 0 | x, 2x, 0 | (-2x), -x, 0 |
| no extra conditions |
| | no extra conditions |
| | no extra conditions |
| | no extra conditions |
| | no extra conditions |
| | no extra conditions |
| | no extra conditions |
| | no extra conditions |
| | no extra conditions |
| | no extra conditions |
Symmetry of special projections
Along [001] p3m1 a' = a b' = b Origin at 0, 0, z | Along [100] p11m a' = 1/2(a + 2b) b' = c Origin at x, 0, 0 | Along [210] p2mm a' = 1/2b b' = c Origin at x, 1/2x, 0 |
Maximal non-isomorphic subgroups
I | | [2] P-611 (P-6, 174) | 1; 2; 3; 4; 5; 6 |
| | [2] P3m1 (156) | 1; 2; 3; 7; 8; 9 |
| | [2] P312 (149) | 1; 2; 3; 10; 11; 12 |
| ![[brace]](/graphics/sg/brace3.gif) | [3] Pmm2 (Amm2, 38) | 1; 4; 7; 10 | | [3] Pmm2 (Amm2, 38) | 1; 4; 8; 11 | | [3] Pmm2 (Amm2, 38) | 1; 4; 9; 12 |
|
IIb | [2] P-6c2 (c' = 2c) (188); [3] H-6m2 (a' = 3a, b' = 3b) (P-62m, 189) |
Maximal isomorphic subgroups of lowest index
IIc | [2] P-6m2 (c' = 2c) (187); [4] P-6m2 (a' = 2a, b' = 2b) (187) |
Minimal non-isomorphic supergroups
I | [2] P6/mmm (191); [2] P63/mmc (194) |