P2(1), P112(1) (4) space group

P2₁ (4) Space Group
- Practical Electron Microscopy and Database -
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Table 1851a. P2₁ (4) space group.

Name in the International Tables for Crystallography	P2₁	Lattice type	P
Patterson space group	10	Point group	2
Crystal system	Monoclinic	Laue class	2/m
Asymm	0 ≤ x ≤ 1 and 0 ≤ y ≤ 1 and 0 ≤ z ≤ 1/2
Number of symmetry operators	2	Absence of reflections	(0 k 0) when k = odd (assuming the unique axis is b)
Translation
Symmetry (atomic coordinates)	X, Y, Z; -X, Y+1/2, -Z
Crystal examples	NaKC₄H₄O6•4H₂O

Table 1851b. P112₁(4) space group.

Name in the International Tables for Crystallography	P112₁	Lattice type	P
Patterson space group		Point group
Crystal system		Laue class
Asymm
Number of symmetry operators		Absence of reflections	0 0 l: l ≠ 2n.
Indication by absence of reflections	A 2₁-screw axis along the c-axis
Translation
Symmetry (atomic coordinates)
Crystal examples

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