| Neptunite | Fe-Ti IVCT | Mattson and Rossman (1988) |
| Ni in minerals | Manceau et al (1985) | |
| Manceau and Calas (1987) | ||
| Rossman et al. (1981) | ||
| Reddy and Lakshman (1975) | ||
| Faye (1974) | ||
| Lakshman and Reddy (1973a) | ||
| Faye (1971b) | ||
| Nussik (1969) | ||
| Nontronite | Fe3+ | Sherman and Vergo (1988b) |
| Bonnin et al. (1985) | ||
| Singer (1982) | ||
| Karickhoff and Bailey (1973) | ||
| Cr3+ | Calas et al. (1984) | |
| Norrishite | Mn3+ | Eggleton and Ashley (1989) |