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FTIR band assignments for montmorillonite clay.
| Wavenumber (cm−1) | Assignments |
|---|---|
| 3697 | O–H stretching |
| 3623 | O–H stretching |
| 3440 | O–H stretching, hydration |
| 1639 | O–H bending, hydration |
| 1113 | Si–O stretching, out-of-plane |
| 1035 | Si−O stretching, in-plane |
| 915 | AlAlOH bending |
| 793 | Tridymite (platy forms) |
| 692 | SiO2 (Quartz) |
| 529 | Si–O bending |
