| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.618 | 0.237 | 0.078 | 1.298 |
| Arsenic | As (ppm) | 0.926 | 0.321 | 0.306 | 2.204 |
| Calcium | Ca (wt%) | 0.731 | 1.136 | 0.071 | 8.232 |
| Copper | Cu (ppm) | 1.930 | 1.011 | 1.014 | 6.069 |
| Iron | Fe (wt%) | 0.248 | 0.100 | 0.033 | 0.753 |
| Mercury | Hg (ppm) | 0.019 | 0.009 | 0.010 | 0.059 |
| Magnesium | Mg (wt%) | 0.030 | 0.014 | 0.007 | 0.108 |
| Manganese | Mn (ppm) | 47.678 | 18.430 | 2.911 | 147.434 |
| Sodium | Na (wt%) | 0.006 | 0.004 | 0.003 | 0.029 |
| Phosphorus | P (wt%) | 0.045 | 0.028 | 0.005 | 0.170 |
| Lead | Pb (ppm) | 9.688 | 3.177 | 2.070 | 21.340 |
| Selenium | Se (ppm) | 0.156 | 0.074 | 0.101 | 0.558 |
| Titanium | Ti (wt%) | 0.195 | 0.089 | 0.032 | 0.533 |
| Zinc | Zn (ppm) | 7.171 | 2.279 | 3.337 | 22.311 |