| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.099 | 0.449 | 1.986 | 4.010 |
| Arsenic | As (ppm) | 4.389 | 2.091 | 1.739 | 14.521 |
| Calcium | Ca (wt%) | 1.737 | 1.875 | 0.237 | 8.633 |
| Copper | Cu (ppm) | 6.639 | 2.901 | 3.007 | 14.883 |
| Iron | Fe (wt%) | 1.286 | 0.223 | 0.766 | 1.858 |
| Mercury | Hg (ppm) | 0.011 | 0.002 | 0.010 | 0.020 |
| Magnesium | Mg (wt%) | 0.275 | 0.056 | 0.136 | 0.412 |
| Manganese | Mn (ppm) | 300.633 | 171.453 | 93.661 | 859.591 |
| Sodium | Na (wt%) | 0.333 | 0.078 | 0.097 | 0.525 |
| Phosphorus | P (wt%) | 0.028 | 0.006 | 0.015 | 0.049 |
| Lead | Pb (ppm) | 16.804 | 5.073 | 10.056 | 38.688 |
| Selenium | Se (ppm) | 0.217 | 0.089 | 0.101 | 0.492 |
| Titanium | Ti (wt%) | 0.205 | 0.025 | 0.144 | 0.286 |
| Zinc | Zn (ppm) | 31.275 | 5.257 | 17.926 | 48.132 |