Pm Cs1 m Monoclinic info
No. 6 P1m1 Patterson symmetry P12/m1
UNIQUE AXIS b

symmetry group diagram

Origin on mirror plane m

Asymmetric unit 0 ≤ x ≤ 1; 0 ≤ y ≤ 1/2; 0 ≤ z ≤ 1

Symmetry operations

(1)  1   (2)  m   x, 0, z  

Generators selected (1); t(1, 0, 0); t(0, 1, 0); t(0, 0, 1); (2)

Positions

Multiplicity, Wyckoff letter,
Site symmetry		 Coordinates Reflection conditions
 General:
2 c 1
(1) x, y, z(2) x, -y, z
no conditions
    Special: as above, plus
1 b  m 
x, 1/2, z
no extra conditions
1 a  m 
x, 0, z
no extra conditions

Symmetry of special projections

Along [001]   p11m
a' = ap   b' = b   
Origin at 0, 0, z		Along [100]   p1m1
a' = b   b' = cp   
Origin at x, 0, 0		Along [010]   p1
a' = c   b' = a   
Origin at 0, y, 0

Maximal non-isomorphic subgroups

I [2] P1 (1)1
IIa none
IIb[2] P1c1 (c' = 2c) (Pc, 7); [2] P1a1 (a' = 2a) (Pc, 7); [2] B1e1 (a' = 2a, c' = 2c) (Pc, 7); [2] C1m1 (a' = 2a, b' = 2b) (Cm, 8); [2] A1m1 (b' = 2b, c' = 2c) (Cm, 8); [2] F1m1 (a' = 2a, b' = 2b, c' = 2c) (Cm, 8)

Maximal isomorphic subgroups of lowest index

IIc[2] P1m1 (b' = 2b) (Pm, 6); [2] P1m1 (c' = 2c or a' = 2a or a' = a + c, c' = -a + c) (Pm, 6)

Minimal non-isomorphic supergroups

I[2] P2/m (10); [2] P21/m (11); [2] Pmm2 (25); [2] Pmc21 (26); [2] Pma2 (28); [2] Pmn21 (31); [2] Amm2 (38); [2] Ama2 (40); [3] P-6 (174)
II[2] C1m1 (Cm, 8); [2] A1m1 (Cm, 8); [2] I1m1 (Cm, 8)








































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