| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.144 | 0.411 | 1.279 | 3.622 |
| Arsenic | As (ppm) | 3.274 | 1.098 | 0.979 | 8.438 |
| Calcium | Ca (wt%) | 0.157 | 0.069 | 0.053 | 0.465 |
| Copper | Cu (ppm) | 3.492 | 1.404 | 1.047 | 8.501 |
| Iron | Fe (wt%) | 1.054 | 0.255 | 0.619 | 2.266 |
| Mercury | Hg (ppm) | 0.011 | 0.001 | 0.010 | 0.016 |
| Magnesium | Mg (wt%) | 0.141 | 0.040 | 0.071 | 0.325 |
| Manganese | Mn (ppm) | 256.338 | 71.152 | 79.413 | 497.671 |
| Sodium | Na (wt%) | 0.289 | 0.081 | 0.141 | 0.552 |
| Phosphorus | P (wt%) | 0.014 | 0.003 | 0.010 | 0.025 |
| Lead | Pb (ppm) | 11.586 | 3.081 | 2.987 | 21.671 |
| Selenium | Se (ppm) | 0.143 | 0.052 | 0.100 | 0.324 |
| Titanium | Ti (wt%) | 0.174 | 0.050 | 0.098 | 0.404 |
| Zinc | Zn (ppm) | 22.840 | 6.549 | 12.398 | 52.027 |