| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.701 | 0.599 | 1.324 | 4.565 |
| Arsenic | As (ppm) | 4.955 | 1.153 | 1.249 | 8.574 |
| Calcium | Ca (wt%) | 3.269 | 1.645 | 0.190 | 8.653 |
| Copper | Cu (ppm) | 7.746 | 1.706 | 2.520 | 15.601 |
| Iron | Fe (wt%) | 1.208 | 0.238 | 0.587 | 1.953 |
| Mercury | Hg (ppm) | 0.012 | 0.002 | 0.010 | 0.019 |
| Magnesium | Mg (wt%) | 0.249 | 0.087 | 0.079 | 0.489 |
| Manganese | Mn (ppm) | 375.696 | 121.723 | 142.528 | 835.463 |
| Sodium | Na (wt%) | 0.247 | 0.119 | 0.068 | 0.687 |
| Phosphorus | P (wt%) | 0.017 | 0.005 | 0.007 | 0.034 |
| Lead | Pb (ppm) | 10.883 | 3.263 | 6.384 | 27.611 |
| Selenium | Se (ppm) | 0.339 | 0.078 | 0.106 | 0.499 |
| Titanium | Ti (wt%) | 0.252 | 0.036 | 0.137 | 0.361 |
| Zinc | Zn (ppm) | 26.132 | 5.788 | 13.696 | 43.692 |