Table 3. Selected bond lengths (Å) for (NH4)Mg(HSO4)(SO4)(H2O)2 at 100 K.
| Mg1—O2 | 2.0382 (9) | S1—O2 | 1.4685 (8) |
| Mg1—O7 | 2.0601 (9) | S1—O3 | 1.4775 (8) |
| Mg1—O3i | 2.0630 (9) | S1—O4 | 1.4901 (9) |
| Mg1—O10 | 2.0645 (9) | S2—O5 | 1.4480 (9) |
| Mg1—O9 | 2.0660 (10) | S2—O6 | 1.4583 (8) |
| Mg1—O6ii | 2.0715 (9) | S2—O7 | 1.4611 (8) |
| S1—O1 | 1.4659 (9) | S2—O8 | 1.5474 (9) |
Symmetry codes: (i) -x, -y+1, -z+1; (ii) -x+1, -y, -z+1.