6/mcc | 6/mmm | Hexagonal |
No. 74 | 6/m2/c2/c | Patterson symmetry 6/mmm |
Origin at centre (6/m) at 6/mcc
Asymmetric unit | 0 ≤ x; 0 ≤ y; 0 ≤ z ≤ 1/4; y ≤ x |
Symmetry operations
(1) 1 | (2) 3+ 0, 0, z | (3) 3- 0, 0, z |
(4) 2 0, 0, z | (5) 6- 0, 0, z | (6) 6+ 0, 0, z |
(7) 2 x, x, 1/4 | (8) 2 x, 0, 1/4 | (9) 2 0, y, 1/4 |
(10) 2 x, -x, 1/4 | (11) 2 x, 2x, 1/4 | (12) 2 2x, x, 1/4 |
(13) -1 0, 0, 0 | (14) -3+ 0, 0, z; 0, 0, 0 | (15) -3- 0, 0, z; 0, 0, 0 |
(16) m x, y, 0 | (17) -6- 0, 0, z; 0, 0, 0 | (18) -6+ 0, 0, z; 0, 0, 0 |
(19) c x, -x, z | (20) c x, 2x, z | (21) c 2x, x, z |
(22) c x, x, z | (23) c x, 0, z | (24) c 0, y, z |
Generators selected (1); t(0, 0, 1); (2); (4); (7); (13)
Positions
Multiplicity, Wyckoff letter, Site symmetry | Coordinates | Reflection conditions | |||||||||||||||||||||||||||
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Special: no extra conditions | |||||||||||||||||
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Symmetry of special projections
Along [001] 6mm Origin at 0, 0, z | Along [100] 2mm a' = 1/2c Origin at x, 0, 0 | Along [210] 2mm a' = 1/2c Origin at x, 1/2x, 0 |
Maximal non-isotypic non-enantiomorphic subgroups
I | [2] -62c (-6c2, 72) | 1; 2; 3; 7; 8; 9; 16; 17; 18; 22; 23; 24 |
[2] -6c2 (72) | 1; 2; 3; 10; 11; 12; 16; 17; 18; 19; 20; 21 | |
[2] 6cc (69) | 1; 2; 3; 4; 5; 6; 19; 20; 21; 22; 23; 24 | |
[2] 622 (62) | 1; 2; 3; 4; 5; 6; 7; 8; 9; 10; 11; 12 | |
[2] 6/m11 (6/m, 60) | 1; 2; 3; 4; 5; 6; 13; 14; 15; 16; 17; 18 | |
[2] -3c1 (-31c, 52) | 1; 2; 3; 7; 8; 9; 13; 14; 15; 19; 20; 21 | |
[2] -31c (52) | 1; 2; 3; 10; 11; 12; 13; 14; 15; 22; 23; 24 | |
[3] mcc (ccm, 21) | 1; 4; 7; 10; 13; 16; 19; 22 | |
[3] mcc (ccm, 21) | 1; 4; 8; 11; 13; 16; 20; 23 | |
[3] mcc (ccm, 21) | 1; 4; 9; 12; 13; 16; 21; 24 |
IIa | none |
IIb | none |
Maximal isotypic subgroups and enantiomorphic subgroups of lowest index
IIc | [3] 6/mcc (c' = 3c) (74) |
Minimal non-isotypic non-enantiomorphic supergroups
I | none |
II | [2] 6/mmm (c' = 1/2c) (73) |