Feature | band or ratio | Comments | Reference | |
Sericite/muscovite/illite/smectite | (5 + 7)/6 | Phyllic alteration | Rowan (USGS); Hewson (CSIRO) | |
Alunite/kaolinite/pyrophyllite | (4 + 6)/5 | Argillic altration | Rowan (USGS) | |
Carbonate/chlorite/epidote | (7 + 9)/8 | Propylitic | Rowan |