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| Temperature (K) | 297 |
| Space group | I4/mmm |
| Fw | 292.6 |
| a (Å) | 3.7846(4) |
| c (Å) | 17.432(1) |
| V (Å3) | 249.69(4) |
| Z | 2 |
| Rp | 2.18% |
| Rwp | 3.05% |
| Rexp | 1.77% |
| GoF-index | 1.7 |
| Atomic parameters | |
| Na | 2a (0, 0, 0) |
| Occ (Na) | 0.67(2) |
| Fe | 4d (0, 0.5, 0.25) |
| Se | 4e (0, 0, z) |
| z = 0.3311(4) | |
| Bond length (Å) | |
| Na-Se | 3.979 (5) ×8 |
| Fe-Se | 2.362 (4) ×4 |
| Fe-Fe | 2.676 (3) ×4 |
| Bond angles (deg.) | 111.0 (1) ×4 |
| 106.5 (2) ×2 |
