Table 4. Selected bond lengths (Å) for RbFe(HAsO4)2 .
| Rb1—O3 | 3.146 (2) | Rb2—O4xi | 3.562 (2) |
| Rb1—O3i | 3.147 (2) | Rb2—O3xii | 3.640 (2) |
| Rb1—O3ii | 3.147 (2) | Rb2—O3xiii | 3.640 (2) |
| Rb1—O3iii | 3.147 (2) | Rb2—O3xiv | 3.640 (2) |
| Rb1—O3iv | 3.147 (2) | Fe1—O2xv | 1.9957 (18) |
| Rb1—O3v | 3.147 (2) | Fe1—O2iii | 1.9957 (18) |
| Rb1—O2ii | 3.3671 (19) | Fe1—O2xvi | 1.9957 (18) |
| Rb1—O2iv | 3.3671 (19) | Fe1—O4xvii | 2.0055 (19) |
| Rb1—O2iii | 3.3671 (19) | Fe1—O4v | 2.0055 (18) |
| Rb1—O2i | 3.3671 (19) | Fe1—O4xviii | 2.0055 (18) |
| Rb1—O2v | 3.3671 (19) | Fe2—O1vii | 1.998 (2) |
| Rb1—O2 | 3.3671 (19) | Fe2—O1xiv | 1.998 (2) |
| Rb2—O3v | 2.965 (2) | Fe2—O1xix | 1.998 (2) |
| Rb2—O3iii | 2.965 (2) | Fe2—O1v | 1.998 (2) |
| Rb2—O3 | 2.965 (2) | Fe2—O1xviii | 1.998 (2) |
| Rb2—O1vi | 3.394 (2) | Fe2—O1xvii | 1.998 (2) |
| Rb2—O1vii | 3.394 (2) | As—O1xx | 1.6555 (19) |
| Rb2—O1viii | 3.394 (2) | As—O2 | 1.6720 (18) |
| Rb2—O4ix | 3.562 (2) | As—O4ii | 1.6801 (18) |
| Rb2—O4x | 3.562 (2) | As—O3 | 1.742 (2) |
Symmetry codes: (i) 
; (ii) 
; (iii) 
; (iv) 
; (v) 
; (vi) 
; (vii) 
; (viii) 
; (ix) 
; (x) 
; (xi) 
; (xii) 
; (xiii) 
; (xiv) 
; (xv) 
; (xvi) 
; (xvii) 
; (xviii) 
; (xix) 
; (xx) 
.