Pmn21 jpeg

International Tabl&s for Crystaltogmphy (2006). VoL A, Space group 31, pp. 230-231.

Pmnh	c^1 ^2v	mml	Orthorhombic
No. 31	Pmnli		Patterson symmetry Pmmm
	Pm nl,	Pm2,n

1- i j	i \	-1 i f
i f i ,	i f	i _i

P2\nm

i	1	o*
i i	i i	o-
s i	j i^łO		bo
“■ j	; ł*o		5*0
i i	i i	o*
i	i	o*

li li li

Origin on mn 1

Asymmetric unit 0<*<*; 0<y<j; 0<z<t

Symmetry operations

(1) 1    (2) 2(0,0,0 |,0,z    (3) «G,0,0 *,0,z    (4) m 0,y,z

CONTINUED

No. 31

Pmn 2

Generators selected (1); f(l,0,0); <(0,1,0); f(0,0,1); (2); (3)

Positions

Multipłicity,    Coordinates

Wyckoff letter,

Site symmetry

Reflection conditłons General:

4 6    1 (l)x,y,z (2)x+\ ,y,z+5    (3) x+{,y,z+ \

(4) x,y,z    hQl:h+l = 2n

600: h = 2n 001 : 1 = 2 n

Special: no extra conditions

2 a m..    0 ,y,z i,y,z + {

Symmetry of special projections

Along [001] p2mg a' = a b = b Originat j,0,z

Along [100] plgl a' = b b' = c

Origin atx,0,0

Along [010] c 11 m a' = c b' = a Origin at 0,y,0

Maximal non-isomorphic subgroups

I	[2] Pini (Pc, 7)	1; 3
	[2] P mil (Pm, 6)	1; 4
	[2)P112I(P2,,4)	1; 2
Ha	nonę
nb	[2] Pbn2, (b' = 2b) (Pna2r 33)

Maximal isomorphic subgroups of Iowest index

He [2] Pmn2, (b' = 2b) (31); [3] Pmn2, (a' = 3a) (31); [3] Pmn2_t (t = 3c) (31)

Minimal non-isomorphic supergroups

I    [2] Pmna (53); [2] Pnnm (58); [2] Pmmn (59); (2] Pnma (62)

II    [2] Cmc2, (36); [2] Bmm2 (Amm2, 38); [2] Ama2(40); [2} /mm2 (44); [2] Pmc2, (a' = {a) (26); [2] Pma2 (c' = jc) (28)

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