| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.279 | 0.157 | 1.843 | 2.723 |
| Arsenic | As (ppm) | 5.052 | 3.336 | 1.676 | 13.072 |
| Calcium | Ca (wt%) | 1.745 | 1.152 | 0.406 | 6.387 |
| Copper | Cu (ppm) | 4.529 | 1.386 | 3.000 | 7.996 |
| Iron | Fe (wt%) | 0.551 | 0.191 | 0.205 | 0.926 |
| Mercury | Hg (ppm) | 0.021 | 0.014 | 0.010 | 0.086 |
| Magnesium | Mg (wt%) | 0.574 | 0.253 | 0.153 | 0.989 |
| Manganese | Mn (ppm) | 95.739 | 22.033 | 41.802 | 153.937 |
| Sodium | Na (wt%) | 0.450 | 0.097 | 0.262 | 0.579 |
| Phosphorus | P (wt%) | 0.018 | 0.005 | 0.011 | 0.035 |
| Lead | Pb (ppm) | 11.078 | 4.962 | 5.093 | 27.978 |
| Selenium | Se (ppm) | 0.160 | 0.043 | 0.100 | 0.297 |
| Titanium | Ti (wt%) | 0.141 | 0.023 | 0.080 | 0.189 |
| Zinc | Zn (ppm) | 17.713 | 6.828 | 6.174 | 32.985 |