Cmc21 C2v12 mm2 Orthorhombic info
No. 36 Cmc21 Patterson symmetry Cmmm

symmetry group diagram

Origin on m c 21

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

Symmetry operations

For (0, 0, 0)+ set

(1)  1   (2)  2(0, 0, 1/2)   0, 0, z(3)  c   x, 0, z(4)  m   0, yz

For (1/21/2, 0)+ set

(1)  t(1/21/2, 0)   (2)  2(0, 0, 1/2)   1/41/4z(3)  n(1/2, 0, 1/2)   x1/4z(4)  b   1/4yz

Generators selected (1); t(1, 0, 0); t(0, 1, 0); t(0, 0, 1); t(1/21/2, 0); (2); (3)

Positions

Multiplicity, Wyckoff letter,
Site symmetry
Coordinates Reflection conditions
 (0, 0, 0)+  (1/21/2, 0)+  General:
8 b 1
(1) xyz(2) -x-yz + 1/2(3) x-yz + 1/2(4) -xyz
hkl: h + k = 2n
0kl: k = 2n
h0l: hl = 2n
hk0: h + k = 2n
h00: h = 2n
0k0: k = 2n
00l: l = 2n
    Special: as above, plus
4 a  m . . 
0, yz 0, -yz + 1/2
no extra conditions

Symmetry of special projections

Along [001]   c2mm
a' = a   b' = b   
Origin at 0, 0, z
Along [100]   p1g1
a' = 1/2b   b' = c   
Origin at x, 0, 0
Along [010]   p11m
a' = 1/2c   b' = 1/2a   
Origin at 0, y, 0








































to end of page
to top of page