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Axes |
Coordinates |
Wyckoff positions |
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2a |
2b |
4c |
4d |
4e |
8f |
| I Maximal translationengleiche subgroups |
| [2] A1m1 (8) |
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2a |
2a |
2 × 2a |
4b |
4b |
2 × 4b |
| [2] Pm11 (6) |
a, (1/2)(b - c), (1/2)(b + c) |
x, y - z, y + z |
1a |
1b |
2c |
2 × 1a |
2 × 1b |
2 × 2c |
![[conventional setting]](/graphics/sg/Wconv.gif) P1m1 |
(1/2)(b + c), a, (1/2)(b - c) |
y + z, x, y - z |
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| [2] A112 (5) |
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2a |
2b |
4c |
4c |
4c |
2 × 4c |
| II Maximal klassengleiche subgroups |
| Loss of centring translations |
| [2] Pnm21 (31) |
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2a |
2a |
2 × 2a |
4b |
4b |
2 × 4b |
| Pmn21 |
b, a, -c |
y, -x, z |
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| [2] Pnc2 (30) |
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2a |
2b |
4c |
4c |
4c |
2 × 4c |
| [2] Pmc21 (26) |
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x, y + (1/4), z |
2a |
2b |
4c |
2 × 2a |
2 × 2b |
2 × 4c |
| [2] Pmm2 (25) |
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1a; 1b |
1c; 1d |
2e; 2f |
2 × 2g |
2 × 2h |
2 × 4i |
| Enlarged unit cell, non-isomorphic |
| [2] Ima2 (46) |
2a, b, c |
(1/2)x, y, z; +((1/2), 0, 0) |
4a |
4b |
8c |
8c |
2 × 4b |
2 × 8c |
| [2] Ima2 (46) |
2a, b, c |
(1/2)x + (1/4), y, z; +((1/2), 0, 0) |
4b |
4a |
8c |
2 × 4b |
8c |
2 × 8c |
| [2] Imm2 (44) |
2a, b, c |
(1/2)x, y, z; +((1/2), 0, 0) |
2a; 2b |
4c |
2 × 4c |
2 × 4d |
8e |
2 × 8e |
| [2] Imm2 (44) |
2a, b, c |
(1/2)x + (1/4), y, z; +((1/2), 0, 0) |
4c |
2a; 2b |
2 × 4c |
8e |
2 × 4d |
2 × 8e |
| [2] Ama2 (40) |
2a, b, c |
(1/2)x, y, z; +((1/2), 0, 0) |
4a |
4b |
8c |
8c |
2 × 4b |
2 × 8c |
| [2] Ama2 (40) |
2a, b, c |
(1/2)x + (1/4), y, z; +((1/2), 0, 0) |
4b |
4a |
8c |
2 × 4b |
8c |
2 × 8c |
| Enlarged unit cell, isomorphic |
| [2] Amm2 |
2a, b, c |
(1/2)x, y, z; +((1/2), 0, 0) |
2a; 2b |
4c |
2 × 4c |
4d; 4e |
8f |
2 × 8f |
| [2] Amm2 |
2a, b, c |
(1/2)x + (1/4), y, z; +((1/2), 0, 0) |
4c |
2a; 2b |
2 × 4c |
8f |
4d; 4e |
2 × 8f |
| [3] Amm2 |
3a, b, c |
(1/3)x, y, z; ±((1/3), 0, 0) |
2a; 4c |
2b; 4c |
3 × 4c |
4d; 8f |
4e; 8f |
3 × 8f |
| [p] Amm2 |
pa, b, c |
(1/p)x, y, z; +((u/p), 0, 0) |
2a; ((p - 1)/2) × 4c |
2b; ((p - 1)/2) × 4c |
p × 4c |
4d; ((p - 1)/2) × 8f |
4e; ((p - 1)/2) × 8f |
p × 8f |
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p = prime > 2; u = 1, . . ., p - 1 |
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| [3] Amm2 |
a, 3b, c |
x, (1/3)y, z; ±(0, (1/3), 0) |
2a; 4d |
2b; 4e |
4c; 8f |
3 × 4d |
3 × 4e |
3 × 8f |
| [p] Amm2 |
a, pb, c |
x, (1/p)y, z; +(0, (u/p), 0) |
2a; ((p - 1)/2) × 4d |
2b; ((p - 1)/2) × 4e |
4c; ((p - 1)/2) × 8f |
p × 4d |
p × 4e |
p × 8f |
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p = prime > 2; u = 1, . . ., p - 1 |
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| [3] Amm2 |
a, b, 3c |
x, y, (1/3)z; ±(0, 0, (1/3)) |
3 × 2a |
3 × 2b |
3 × 4c |
3 × 4d |
3 × 4e |
3 × 8f |
| [p] Amm2 |
a, b, pc |
x, y, (1/p)z; +(0, 0, (u/p)) |
p × 2a |
p × 2b |
p × 4c |
p × 4d |
p × 4e |
p × 8f |
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p = prime > 2; u = 1, . . ., p - 1 |
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