Cmc21 No. 36 C2v12


Axes Coordinates Wyckoff positions
4a 8b
I Maximal translationengleiche subgroups
[2] C1c1 (9) 4a 2 × 4a
[2] Cm11 (8) 2 × 2a 2 × 4b
[conventional setting]C1m1 b, a, -c y, x, -z
[2] P1121 (4) (1/2)(a - b), (1/2)(a + b), c x - y, x + y, z 2a 2 × 2a
II Maximal klassengleiche subgroups
   Loss of centring translations
[2] Pbn21 (33) 4a 2 × 4a
[conventional setting]Pna21 b, a, -c y, x, -z
[2] Pmn21 (31) x, y + (1/4), z 2 × 2a 2 × 4b
[2] Pbc21 (29) x + (1/4), y + (1/4), z 4a 2 × 4a
[conventional setting]Pca21 b, a, -c y + (1/4), x + (1/4), -z
[2] Pmc21 (26) 2a; 2b 2 × 4c
   Enlarged unit cell, isomorphic
[3] Cmc21 3a, b, c (1/3)x, y, z; ±((1/3), 0, 0) 4a; 8b 3 × 8b
[p] Cmc21 pa, b, c (1/p)x, y, z; +((u/p), 0, 0) 4a; (1/2)(p - 1) × 8b p × 8b
p = prime > 2; u = 1, . . ., p - 1
[3] Cmc21 a, 3b, c x, (1/3)y, z; ±(0, (1/3), 0) 3 × 4a 3 × 8b
[p] Cmc21 a, pb, c x, (1/p)y, z; +(0, (u/p), 0) p × 4a p × 8b
p = prime > 2; u = 1, . . ., p - 1
[3] Cmc21 a, b, 3c x, y, (1/3)z; ±(0, 0, (1/3)) 3 × 4a 3 × 8b
[p] Cmc21 a, b, pc x, y, (1/p)y; +(0, 0, (u/p)) p × 4a p × 8b
p = prime > 2; u = 1, . . ., p - 1


Nonconventional settings
        interchange letters and sequences in Hermann-Mauguin symbols, axes and coordinates:
A21ma C → A a→ b → c → a a→ b → c → a x→ y → z → x
Bb21m C→ B a← b ← c ← a a← b ← c ← a x← y ← z ← x
Ccm21 a<-> b a<-> -b x<-> -y
A21am C→ A a<-> c a<-> -c x<-> -z
Bm21b C→ B b<-> c b<-> -c y<-> -z









































to end of page
to top of page