| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.817 | 0.465 | 1.926 | 4.693 |
| Arsenic | As (ppm) | 5.244 | 1.431 | 1.913 | 10.038 |
| Calcium | Ca (wt%) | 0.552 | 0.193 | 0.217 | 1.308 |
| Copper | Cu (ppm) | 10.005 | 2.784 | 4.906 | 20.626 |
| Iron | Fe (wt%) | 1.428 | 0.240 | 0.960 | 2.395 |
| Mercury | Hg (ppm) | 0.012 | 0.002 | 0.010 | 0.020 |
| Magnesium | Mg (wt%) | 0.235 | 0.056 | 0.081 | 0.464 |
| Manganese | Mn (ppm) | 461.224 | 183.149 | 211.564 | 1128.530 |
| Sodium | Na (wt%) | 0.374 | 0.083 | 0.211 | 0.575 |
| Phosphorus | P (wt%) | 0.020 | 0.004 | 0.010 | 0.030 |
| Lead | Pb (ppm) | 13.363 | 2.088 | 8.178 | 21.306 |
| Selenium | Se (ppm) | 0.132 | 0.019 | 0.101 | 0.188 |
| Titanium | Ti (wt%) | 0.229 | 0.029 | 0.184 | 0.332 |
| Zinc | Zn (ppm) | 26.497 | 4.781 | 14.171 | 41.408 |