| A | This mineral is Anthropogenic. |
| G | This mineral is directly dated. |
| B | This mineral is reported as having this age. |
| Y | This mineral is using an age reported as an element mineralization period. |
| O | This mineral is using an age calculated from all data at the locality. |
| R | The age displayed for this mineral originates from a different, non-child locality. |
| P | The age displayed for this mineral is the range of ages for this mineral at all of this locality's children. |
| This mineral's age has not yet been recorded. |
| Corundum | Iron | None | Not in a structural group | Post-spinel | Ramsdellite | Spinel |
| Anatase (*) | Chromite (*) | Cuprite (*) | Cuprospinel (*) | Hematite (*) |
| Karelianite (*) | Maghemite (*) | Marokite (*) | Mullite (*) | Ramsdellite (*) |
| Zhanghengite (*) | Zincochromite (*) |
| Mineral name | Structural Groups | IMA Formula | Max Age (Ma) | Min Age (Ma) | # of Sublocalities containing mineral | LOCALITY IDs, not mindat ids | # of localities containing mineral |
|---|---|---|---|---|---|---|---|
| Anatase (*) | Not in a structural group | TiO2 | 0 | 2162 | |||
| Chromite (*) | Spinel | Fe2+Cr2O4 | 0 | 3902 | |||
| Cuprite (*) | Not in a structural group | Cu2O | 0 | 2970 | |||
| Cuprospinel (*) | Spinel | Cu2+Fe3+2O4 | 0 | 0 | 0 | 4 | |
| Hematite (*) | Corundum | Fe2O3 | 0 | 14640 | |||
| Karelianite (*) | Corundum | V2O3 | 0 | 17 | |||
| Maghemite (*) | Spinel | (Fe3+0.67 0.33)Fe3+2O4 | 0 | 229 | |||
| Marokite (*) | Post-spinel | CaMn3+2O4 | 0 | 8 | |||
| Mullite (*) | None | Al4+2xSi2-2xO10-x (x ≈ 0.4) | 0 | 78 | |||
| Ramsdellite (*) | Ramsdellite | MnO2 | 0 | 88 | |||
| Zhanghengite (*) | Iron | CuZn | 0 | 6 | |||
| Zincochromite (*) | Spinel | ZnCr2O4 | 0 | 11 |
All locality data graciously provided by mindat.org
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