Origin on 12a

Asymmetric unit

0 ≤ x ≤ 1/4; 0 ≤ y ≤ 1

(1)  1

(2)  2   0, y, 0

(3)  a   x, y, 0

(4)  m   1/4, 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, -z (3) x + 1/2, y, -z (4) -x + 1/2, y, z	hk: h = 2n h0: h = 2n

		Special: no extra conditions
2 b  m . .	1/4, y, z 3/4, y, -z
2 a  . 2 .	0, y, 0 1/2, y, 0

Symmetry of special projections

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

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

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

Maximal non-isotypic subgroups

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I	[2] pm11 (11)	1; 4
	[2] p121 (p211, 8)	1; 2
	[2] p11a (5)	1; 3

IIa

none

IIb	[2] pb2n (b' = 2b) (34); [2] pb21a (b' = 2b) (33); [2] pm21n (b' = 2b) (32)

Maximal isotypic subgroups of lowest index

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IIc	[2] pm2a (b' = 2b) (31); [3] pm2a (a' = 3a) (31)

Minimal non-isotypic supergroups

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I	[2] pmaa (38); [2] pmma (41)

II	[2] cm2e (36); [2] pm2m (a' = 1/2a) (27)

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