Origin at -1 on b1a

Asymmetric unit

0 ≤ x ≤ 1/2; 0 ≤ y ≤ 1/2; 0 ≤ z

(1)  1	(2)  2   x, 1/4, 0	(3)  2   1/4, 0, z	(4)  2(0, 1/2, 0)   1/4, y, 0
(5)  -1   0, 0, 0	(6)  b   0, y, z	(7)  a   x, y, 0	(8)  a   x, 1/4, z

Generators selected (1); t(1, 0, 0); t(0, 1, 0); (2); (3); (5)

Positions

Multiplicity, Wyckoff letter, Site symmetry	Coordinates	Reflection conditions
		General:
8 d 1	(1) x, y, z (2) x, -y + 1/2, -z (3) -x + 1/2, -y, z (4) -x + 1/2, y + 1/2, -z (5) -x, -y, -z (6) -x, y + 1/2, z (7) x + 1/2, y, -z (8) x + 1/2, -y + 1/2, z	hk: h = 2n h0: h = 2n 0k: k = 2n

		Special: as above, plus
4 c  2 . .	x, 1/4, 0 -x + 1/2, 3/4, 0 -x, 3/4, 0 x + 1/2, 1/4, 0	no extra conditions
4 b  . . 2	1/4, 0, z 1/4, 1/2, -z 3/4, 0, -z 3/4, 1/2, z	hk: h + k = 2n
4 a  -1	0, 0, 0 0, 1/2, 0 1/2, 0, 0 1/2, 1/2, 0	hk: h, k = 2n

Symmetry of special projections

Along [001]   p2mg a' = b   b' = -1/2a    Origin at 0, 0, z

Along [100]   2mm a' = 1/2b    Origin at x, 0, 0

Along [010]   2mm a' = 1/2a    Origin at 0, y, 0

Maximal non-isotypic subgroups

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I	[2] pb21a (33)	1; 4; 6; 7
	[2] p2aa (pb2b, 30)	1; 2; 7; 8
	[2] pba2 (25)	1; 3; 6; 8
	[2] p2212 (p2122, 20)	1; 2; 3; 4
	[2] p121/a1 (p21/b11, 17)	1; 4; 5; 8
	[2] p2/b11 (16)	1; 2; 5; 6
	[2] p112/a (7)	1; 3; 5; 7

IIa

none

IIb

none

Maximal isotypic subgroups of lowest index

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IIc	[3] pbaa (a' = 3a) (43); [3] pbaa (b' = 3b) (43)

Minimal non-isotypic supergroups

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I

none

II	[2] cmme (48); [2] pmaa (b' = 1/2b) (38); [2] pmam (b' = 1/2b) (40)

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