| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.611 | 0.523 | 0.625 | 3.416 |
| Arsenic | As (ppm) | 4.721 | 1.284 | 2.043 | 8.953 |
| Calcium | Ca (wt%) | 0.288 | 0.190 | 0.037 | 1.176 |
| Copper | Cu (ppm) | 4.144 | 1.258 | 1.386 | 7.660 |
| Iron | Fe (wt%) | 0.857 | 0.256 | 0.357 | 1.944 |
| Mercury | Hg (ppm) | 0.013 | 0.003 | 0.010 | 0.028 |
| Magnesium | Mg (wt%) | 0.095 | 0.033 | 0.029 | 0.198 |
| Manganese | Mn (ppm) | 176.003 | 46.277 | 56.386 | 344.165 |
| Sodium | Na (wt%) | 0.096 | 0.111 | 0.019 | 0.464 |
| Phosphorus | P (wt%) | 0.009 | 0.002 | 0.005 | 0.014 |
| Lead | Pb (ppm) | 7.842 | 1.666 | 4.127 | 12.976 |
| Selenium | Se (ppm) | 0.140 | 0.038 | 0.100 | 0.277 |
| Titanium | Ti (wt%) | 0.275 | 0.085 | 0.137 | 0.531 |
| Zinc | Zn (ppm) | 13.936 | 4.752 | 3.507 | 26.797 |