Pnc2 C2v6 mm2 Orthorhombic info
No. 30 Pnc2 Patterson symmetry Pmmm

symmetry group diagram

Origin on n 1 2

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

Symmetry operations

(1)  1   (2)  2   0, 0, z(3)  c   x1/4z(4)  n(0, 1/21/2)   0, yz

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:
4 c 1
(1) xyz(2) -x-yz(3) x-y + 1/2z + 1/2(4) -xy + 1/2z + 1/2
0kl: k + l = 2n
h0l: l = 2n
0k0: k = 2n
00l: l = 2n
    Special: as above, plus
2 b  . . 2 
1/2, 0, z 1/21/2z + 1/2
hkl: k  +  l  =  2n
2 a  . . 2 
0, 0, z 0, 1/2z + 1/2
hkl: k  +  l  =  2n

Symmetry of special projections

Along [001]   p2gm
a' = a   b' = b   
Origin at 0, 0, z
Along [100]   c1m1
a' = b   b' = c   
Origin at x, 0, 0
Along [010]   p11m
a' = 1/2c   b' = a   
Origin at 0, y, 0








































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