Table 1. Experimental details.

Crystal data
Chemical formula	Na1.67Zn1.67Fe1.33(PO4)3
M r	506.59
Crystal system, space group	Monoclinic, C2/c
Temperature (K)	296
a, b, c ()	11.7545(4), 12.5080(4), 6.4014(2)
()	113.507(1)
V (3)	863.06(5)
Z	4
Radiation type	Mo K
(mm1)	7.52
Crystal size (mm)	0.31 0.25 0.19
Data collection
Diffractometer	Bruker X8 APEX
Absorption correction	Multi-scan (SADABS; Bruker, 2009 ▸)
T min, T max	0.504, 0.748
No. of measured, independent and observed [I > 2(I)] reflections	18880, 2101, 1997
R int	0.031
(sin /)max (1)	0.833
Refinement
R[F 2 > 2(F 2)], wR(F 2), S	0.017, 0.046, 1.19
No. of reflections	2101
No. of parameters	96
max, min (e 3)	0.65, 1.21

Computer programs: APEX2 and SAINT (Bruker, 2009 ▸), SHELXS97 and SHELXL97 (Sheldrick, 2008 ▸), ORTEPIII (Burnett Johnson, 1996 ▸), ORTEP-3 for Windows Farrugia, 2012 ▸), DIAMOND (Brandenburg, 2006 ▸) and publCIF (Westrip, 2010 ▸).