| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 4.317 | 0.806 | 3.432 | 7.591 |
| Arsenic | As (ppm) | 5.313 | 0.694 | 3.745 | 7.269 |
| Calcium | Ca (wt%) | 2.744 | 1.180 | 1.050 | 9.171 |
| Copper | Cu (ppm) | 13.588 | 4.417 | 7.995 | 30.252 |
| Iron | Fe (wt%) | 1.817 | 0.566 | 1.349 | 4.273 |
| Mercury | Hg (ppm) | 0.011 | 0.001 | 0.010 | 0.017 |
| Magnesium | Mg (wt%) | 0.617 | 0.250 | 0.383 | 1.417 |
| Manganese | Mn (ppm) | 413.639 | 46.395 | 285.700 | 556.819 |
| Sodium | Na (wt%) | 0.596 | 0.129 | 0.254 | 0.844 |
| Phosphorus | P (wt%) | 0.038 | 0.003 | 0.029 | 0.048 |
| Lead | Pb (ppm) | 15.727 | 2.735 | 10.100 | 23.743 |
| Selenium | Se (ppm) | 0.199 | 0.101 | 0.100 | 0.628 |
| Titanium | Ti (wt%) | 0.229 | 0.027 | 0.173 | 0.336 |
| Zinc | Zn (ppm) | 43.726 | 8.965 | 27.304 | 74.635 |