Aea2 C2v17 mm2 Orthorhombic info
No. 41 Aea2 Patterson symmetry Ammm (Cmmm)

symmetry group diagram

Origin on 1 n 2

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, z(3)  a   x1/4z(4)  b   1/4yz

For (0, 1/21/2)+ set

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

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

Positions

Multiplicity, Wyckoff letter,
Site symmetry
Coordinates Reflection conditions
 (0, 0, 0)+  (0, 1/21/2)+  General:
8 b 1
(1) xyz(2) -x-yz(3) x + 1/2-y + 1/2z(4) -x + 1/2y + 1/2z
hkl: k + l = 2n
0kl: kl = 2n
h0l: hl = 2n
hk0: k = 2n
h00: h = 2n
0k0: k = 2n
00l: l = 2n
    Special: as above, plus
4 a  . . 2 
0, 0, z 1/21/2z
hkl: h  +  k  =  2n

Symmetry of special projections

Along [001]   p2mg
a' = a   b' = 1/2b   
Origin at 0, 0, z
Along [100]   p1m1
a' = 1/2b   b' = 1/2c   
Origin at x, 0, 0
Along [010]   p11m
a' = 1/2c   b' = 1/2a   
Origin at 0, y, 0








































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