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@wikipedia
Natural Gamma Ray emission from subsurface rocks
The typical GR values for popular minerals is brought on Table 1.
| Table 1. GR values for popular minerals |
| Rock Type | GR, API |
| 1 | Halite (NaCl) | 0 |
| 2 | Coal | 0 |
| 3 | Limestone | 5 – 10 |
| 4 | Sandstone | 10 – 20 |
| 5 | Dolomite | 10 – 20 |
| 6 | Shale | 80 – 140 |
| 7 | Mica | 100 – 170 |
| 8 | Silvite (KCl) | 500 |
