| 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. |
| Calcite | None | Ramsdellite |
| Birnessite (*) | Kutnohorite (*) | Nsutite (*) | Rhodochrosite (*) |
| 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 |
|---|---|---|---|---|---|---|---|
| Birnessite (*) | None | (Na,Ca,K)0.6(Mn4+,Mn3+)2O4·1.5H2O | 0 | 178 | |||
| Kutnohorite (*) | None | CaMn2+(CO3)2 | 0 | 234 | |||
| Nsutite (*) | Ramsdellite | Mn2+xMn4+1-xO2-2x(OH)2x | 0 | 121 | |||
| Rhodochrosite (*) | Calcite | Mn(CO3) | 0 | 1711 |
All locality data graciously provided by mindat.org
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