| Zinnwaldite | Fe2+ | Rossman (1984) |
| Zircon | U4+, U5+ | Vance and Mackey (1978) |
| U5+ | Vance and Mackey (1974,1975) | |
| U4+ | Richman et al. (1967) | |
| V4+ | Demiray et al. (1970) | |
| Nb4+ | Fielding (1970) | |
| Zoisite | V3+ | Platonov (1976) |
| Faye and Nickel (1971) | ||
| Tsang and Ghose (1971) | ||
| Cr3+ | Schmetzer and Berdesinski (1978) | |
| Mn3+ | Langer et al. (2003) | |
| Mn | Srinivasulu et al. (1992) | |