Origin on m2₁b

Asymmetric unit

0 ≤ x ≤ 1/2; 0 ≤ y ≤ 1; 0 ≤ z

(1)  1

(2)  2(0, 1/2, 0)   0, y, 0

(3)  b   x, y, 0

(4)  m   0, y, z

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

Positions

Multiplicity, Wyckoff letter, Site symmetry	Coordinates	Reflection conditions
		General:
4 c 1	(1) x, y, z (2) -x, y + 1/2, -z (3) x, y + 1/2, -z (4) -x, y, z	hk: k = 2n 0k: k = 2n

		Special: no extra conditions
2 b  m . .	1/2, y, z 1/2, y + 1/2, -z
2 a  m . .	0, y, z 0, y + 1/2, -z

Symmetry of special projections

Along [001]   p1m1 a' = a   b' = 1/2b    Origin at 0, 0, z

Along [100]   11g a' = b    Origin at x, 0, 0

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

Maximal non-isotypic subgroups

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I	[2] pm11 (11)	1; 4
	[2] p1211 (p2111, 9)	1; 2
	[2] p11b (p11a, 5)	1; 3

IIa

none

IIb	[2] pm21n (a' = 2a) (32)

Maximal isotypic subgroups of lowest index

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IIc	[2] pm21b (a' = 2a) (28); [3] pm21b (b' = 3b) (28)

Minimal non-isotypic supergroups

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I	[2] pmma (41); [2] pbma (45)

II	[2] cm2m (35); [2] cm2e (36); [2] pm2m (b' = 1/2b) (27)

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