| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.637 | 0.175 | 0.144 | 1.094 |
| Arsenic | As (ppm) | 0.819 | 0.195 | 0.370 | 1.482 |
| Calcium | Ca (wt%) | 0.918 | 0.807 | 0.070 | 5.704 |
| Copper | Cu (ppm) | 3.738 | 1.515 | 1.182 | 11.857 |
| Iron | Fe (wt%) | 0.240 | 0.081 | 0.031 | 0.584 |
| Mercury | Hg (ppm) | 0.011 | 0.001 | 0.010 | 0.015 |
| Magnesium | Mg (wt%) | 0.028 | 0.009 | 0.009 | 0.068 |
| Manganese | Mn (ppm) | 62.408 | 20.866 | 10.050 | 125.697 |
| Sodium | Na (wt%) | 0.004 | 0.001 | 0.003 | 0.008 |
| Phosphorus | P (wt%) | 0.053 | 0.023 | 0.007 | 0.128 |
| Lead | Pb (ppm) | 7.478 | 1.583 | 2.914 | 11.784 |
| Selenium | Se (ppm) | 0.101 | 0.002 | 0.100 | 0.108 |
| Titanium | Ti (wt%) | 0.194 | 0.024 | 0.057 | 0.238 |
| Zinc | Zn (ppm) | 9.060 | 2.993 | 3.647 | 25.972 |