| 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. |
| Brewsterite | Harmotome | Heulandite | None |
| Brewsterite-Ba (*) | Brewsterite-Sr (*) | Harmotome (*) | Heulandite-Ba (*) |
| 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 |
|---|---|---|---|---|---|---|---|
| Brewsterite-Ba (*) | Brewsterite | Ba(Al2Si6)O16·5H2O | 0 | 9 | |||
| Brewsterite-Sr (*) | Brewsterite | Sr(Al2Si6)O16·5H2O | 0 | 8 | |||
| Harmotome (*) | Harmotome | Ba2(Si12Al4)O32·12H2O | 0 | 290 | |||
| Heulandite-Ba (*) | Heulandite | (Ba,Ca,K)5(Si27Al9)O72·22H2O | 0 | 8 |
All locality data graciously provided by mindat.org
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