Analytical method: UNKNOWN
| Technique | UNKNOWN |
|---|---|
| Material | WHOLE ROCK |
| Mineral | none |
| Comment | Total Fe as FeOT |
| Reference | Dahl, David Alvin (1984) Petrology and geochemistry of nepheline trachytes and phonolites in the Black Hills area, Brewster County, Trans-Pecos, Texas. |