| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.475 | 0.301 | 0.068 | 2.077 |
| Arsenic | As (ppm) | 0.980 | 0.417 | 0.342 | 3.319 |
| Calcium | Ca (wt%) | 0.679 | 1.015 | 0.036 | 9.223 |
| Copper | Cu (ppm) | 2.182 | 0.834 | 1.014 | 7.697 |
| Iron | Fe (wt%) | 0.203 | 0.107 | 0.017 | 0.805 |
| Mercury | Hg (ppm) | 0.012 | 0.003 | 0.010 | 0.044 |
| Magnesium | Mg (wt%) | 0.129 | 0.279 | 0.005 | 2.890 |
| Manganese | Mn (ppm) | 42.414 | 24.955 | 8.773 | 225.251 |
| Sodium | Na (wt%) | 0.008 | 0.008 | 0.003 | 0.058 |
| Phosphorus | P (wt%) | 0.039 | 0.048 | 0.003 | 0.466 |
| Lead | Pb (ppm) | 6.743 | 2.281 | 2.347 | 15.959 |
| Selenium | Se (ppm) | 0.171 | 0.153 | 0.100 | 1.668 |
| Titanium | Ti (wt%) | 0.176 | 0.045 | 0.101 | 0.387 |
| Zinc | Zn (ppm) | 11.415 | 6.016 | 2.650 | 57.218 |