| FeMgMo3NaO12 | Z = 2 |
| Mr = 582.97 | F(000) = 542 |
| Triclinic, P1 | Dx = 3.786 Mg m−3 |
| a = 6.900 (4) Å | Mo Kα radiation, λ = 0.71073 Å |
| b = 6.928 (1) Å | Cell parameters from 25 reflections |
| c = 11.055 (1) Å | θ = 9.1–11.4° |
| α = 80.24 (1)° | µ = 5.15 mm−1 |
| β = 83.55 (2)° | T = 293 K |
| γ = 80.22 (3)° | Prism, brown |
| V = 511.3 (3) Å3 | 0.28 × 0.14 × 0.07 mm |