Origin on m c 21
Asymmetric unit | 0 ≤ x ≤ 1/2; 0 ≤ y ≤ 1/2; 0 ≤ z ≤ 1 |
Symmetry operations
(1) 1 | (2) 2(0, 0, 1/2) 0, 0, z | (3) c x, 0, z | (4) m 0, y, z |
Generators selected (1); t(1, 0, 0); t(0, 1, 0); t(0, 0, 1); (2); (3)
Positions
Multiplicity, Wyckoff letter, Site symmetry | Coordinates | Reflection conditions | |||||||
General: | |||||||||
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| h0l : l = 2n 00l : l = 2n |
Special: as above, plus | |||||||
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| no extra conditions | |||||
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| no extra conditions |
Symmetry of special projections
Along [001] p2mm a' = a b' = b Origin at 0, 0, z | Along [100] p1g1 a' = b b' = c Origin at x, 0, 0 | Along [010] p11m a' = 1/2c b' = a Origin at 0, y, 0 |
Maximal non-isomorphic subgroups
I | [2] P1c1 (Pc, 7) | 1; 3 | |
[2] Pm11 (Pm, 6) | 1; 4 | ||
[2] P1121 (P21, 4) | 1; 2 |
IIa | none |
IIb | [2] Pmn21 (a' = 2a) (31); [2] Pbc21 (b' = 2b) (Pca21, 29); [2] Cmc21 (a' = 2a, b' = 2b) (36) |
Maximal isomorphic subgroups of lowest index
IIc | [2] Pmc21 (a' = 2a) (26); [2] Pmc21 (b' = 2b) (26); [3] Pmc21 (c' = 3c) (26) |
Minimal non-isomorphic supergroups
I | [2] Pmma (51); [2] Pbam (55); [2] Pbcm (57); [2] Pnma (62) |
II | [2] Cmc21 (36); [2] Amm2 (38); [2] Bme2 (Aem2, 39); [2] Ima2 (46); [2] Pmm2 (c' = 1/2c) (25) |