| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.937 | 0.627 | 1.685 | 4.889 |
| Arsenic | As (ppm) | 4.479 | 1.346 | 1.626 | 9.744 |
| Calcium | Ca (wt%) | 1.583 | 1.209 | 0.123 | 6.231 |
| Copper | Cu (ppm) | 7.643 | 1.534 | 5.016 | 11.678 |
| Iron | Fe (wt%) | 1.316 | 0.268 | 0.654 | 2.103 |
| Mercury | Hg (ppm) | 0.014 | 0.003 | 0.010 | 0.022 |
| Magnesium | Mg (wt%) | 0.327 | 0.098 | 0.093 | 0.536 |
| Manganese | Mn (ppm) | 180.960 | 37.204 | 82.649 | 268.846 |
| Sodium | Na (wt%) | 0.317 | 0.062 | 0.171 | 0.463 |
| Phosphorus | P (wt%) | 0.019 | 0.007 | 0.005 | 0.043 |
| Lead | Pb (ppm) | 12.595 | 3.138 | 7.023 | 21.782 |
| Selenium | Se (ppm) | 0.159 | 0.068 | 0.100 | 0.398 |
| Titanium | Ti (wt%) | 0.188 | 0.026 | 0.106 | 0.247 |
| Zinc | Zn (ppm) | 29.266 | 7.566 | 12.108 | 49.618 |