Table 2 Relative abundances of lepidocrocite and magnetite/maghemite appearing in 57Fe Mössbauer spectra at 77 K
From: Fe(II) reduction of pyrolusite (β-MnO2) and secondary mineral evolution
Fe(II) addition | Appearance of 57Fe(II) in Seriesa | ||||
|---|---|---|---|---|---|
1st (Lep./Mag.) | 2nd (Lep./Mag.) | 3rd (Lep./Mag.) | 6th (Lep./Mag.) | 9th (Lep./Mag.) | |
# 1 | 100/0 | NAb | NA | NA | NA |
# 2 | 85/15 | 57/43 | NA | NA | NA |
# 3 | 75/25 | 46/54 | 52/48 | NA | NA |
# 6 | –c | – | – | 9/91 | NA |
# 9 | – | – | – | – | 3/97 |