| Minimum | Maximum | Mean | Std. Deviation |
Ca/Si | 1.187 | 4.555 | 3.065 | 0.829 |
K/Na | 0.053 | 0.649 | 0.354 | 0.173 |
Na/Cl | 0.197 | 0.731 | 0.349 | 0.153 |
K/Cl | 0.012 | 0.244 | 0.116 | 0.057 |