| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.887 | 0.615 | 0.862 | 3.983 |
| Arsenic | As (ppm) | 3.937 | 0.693 | 2.664 | 5.700 |
| Calcium | Ca (wt%) | 0.017 | 0.005 | 0.008 | 0.038 |
| Copper | Cu (ppm) | 4.673 | 0.897 | 3.565 | 7.893 |
| Iron | Fe (wt%) | 1.372 | 0.309 | 0.895 | 2.488 |
| Mercury | Hg (ppm) | 0.017 | 0.005 | 0.011 | 0.035 |
| Magnesium | Mg (wt%) | 0.029 | 0.010 | 0.016 | 0.063 |
| Manganese | Mn (ppm) | 109.512 | 30.300 | 58.401 | 219.335 |
| Sodium | Na (wt%) | 0.009 | 0.002 | 0.004 | 0.017 |
| Phosphorus | P (wt%) | 0.015 | 0.003 | 0.009 | 0.025 |
| Lead | Pb (ppm) | 13.827 | 3.663 | 6.037 | 21.801 |
| Selenium | Se (ppm) | 0.210 | 0.068 | 0.109 | 0.384 |
| Titanium | Ti (wt%) | 0.450 | 0.048 | 0.280 | 0.589 |
| Zinc | Zn (ppm) | 12.982 | 2.317 | 8.820 | 19.659 |