Table 2.
Frequency in cm-1 recorded on the white and red clay attributed to the molecular grouping.
| Clay type | Bands (cm-1) | Assignments |
|---|---|---|
| White | 3620 and 3405 | Asymmetric and symmetric stretching vibrations of OH |
| Red | 3612 and 3397 | |
| White | 2516 and 1794 | Stretching vibration of CO2 |
| White | 1636 | Functional grouping of H–O–H |
| Red | 1635 | |
| Red | 1405 and 876 | Bending vibrations of –C=O in carbonates |
| White | 1400 | |
| White | 1005 and 426 | Stretching vibrations of Si–O–T (T = Si or Al) bonds |
| Red | 983 and 425 | |
| White | 868 | Bending vibrations of C=O in carbonates |
| White | 797 and 711 | Stretching and Bending of Si–O–Al bonds |
| Red | 792 and 768 | |
| Red | 682 | Bending vibrations of Si–O–Si bonds |
| White | 518 | Bending vibration of Al–O–Si bonds |
| Red | 518 | |
| White | 469 | Bending vibration of Si–O-Si bonds |
| Red | 460 |