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Band Positions for 2LO Modes for Various Fe-Oxide and Fe-Oxyhydroxide Minerals in the 1300–1600 Δ cm−1 Region
| Fe-oxide and Fe-oxyhydroxide mineral | Formula | Crystallography | 2LO band position (Δ cm−1) |
|---|---|---|---|
| Goethite | α-FeOOH | orthorombic | 1304 |
| Akaganeite | β-FeOOH | monoclinic | 1410 |
| Lepidocrocite | γ-FeOOH | orthorombic | 1300 |
| Maghemite | γ -Fe2O3 | cubic or trigonal | 1430 |
| 6-line ferrihydrite | Fe(O,OH)6 | trigonal | 1291 |
| 2-line ferrihydrite | Fe(O,OH)6 | trigonal | 1340 |
| Hematite | α-Fe2O3 | trigonal | 1320 |
