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Raman band assignments for montmorillonite clay.
| 3620 cm−1 | υ(OH) structural OH groups |
| 1110 cm−1 | υ(SiO) asymmetric mode of SiO4 tetrahedron |
| 915 cm−1 | δ(OH) bonded with octahedral cations; AlOH; wagging mode |
| 840 cm−1 | δ(OH) bonded with octahedral cations; MgAlOH; wagging mode |
| 785 cm−1 | δ(OH) bonded with octahedral cations; AlOH; wagging mode |
| 710 cm−1 | δ(SiO) symmetric mode (A1) of SiO4 tetrahedron |
| 430 cm−1 | δ(OH) libration of OH |
