| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.092 | 0.647 | 0.802 | 5.253 |
| Arsenic | As (ppm) | 5.999 | 2.979 | 1.629 | 29.411 |
| Calcium | Ca (wt%) | 1.545 | 1.245 | 0.234 | 9.962 |
| Copper | Cu (ppm) | 6.199 | 1.214 | 3.153 | 12.499 |
| Iron | Fe (wt%) | 1.465 | 0.349 | 0.395 | 2.503 |
| Mercury | Hg (ppm) | 0.012 | 0.002 | 0.010 | 0.025 |
| Magnesium | Mg (wt%) | 0.301 | 0.090 | 0.053 | 0.552 |
| Manganese | Mn (ppm) | 394.099 | 150.933 | 96.439 | 905.091 |
| Sodium | Na (wt%) | 0.298 | 0.067 | 0.068 | 0.483 |
| Phosphorus | P (wt%) | 0.026 | 0.006 | 0.012 | 0.048 |
| Lead | Pb (ppm) | 21.243 | 5.292 | 5.560 | 51.749 |
| Selenium | Se (ppm) | 0.216 | 0.059 | 0.100 | 0.465 |
| Titanium | Ti (wt%) | 0.218 | 0.021 | 0.090 | 0.306 |
| Zinc | Zn (ppm) | 32.029 | 8.088 | 10.294 | 58.214 |