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Abnormal absorption band of iron dye, hydroxyl.
| Ion,perssad | Absorption spectrum/µm | ASTER band | Typical minerals |
|---|---|---|---|
| Fe2+, Fe3+ | Fe2+: 1.1–2.4; | Band1, Band3 | Pyrite, jarosite and magnetite |
| Fe3+: 0.45, 0.55, 0.85, 0.90, 0.94 | |||
| AL–OH | AL–OH: 2.20 | AL–OH: Band5, Band6 | Kaolinite, Muscovite, serpentine |
