| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 5.028 | 0.532 | 3.370 | 5.938 |
| Arsenic | As (ppm) | 12.841 | 3.215 | 7.028 | 25.388 |
| Calcium | Ca (wt%) | 0.711 | 0.101 | 0.469 | 1.230 |
| Copper | Cu (ppm) | 13.050 | 2.316 | 8.647 | 22.584 |
| Iron | Fe (wt%) | 1.854 | 0.152 | 1.413 | 2.223 |
| Mercury | Hg (ppm) | 0.035 | 0.011 | 0.013 | 0.099 |
| Magnesium | Mg (wt%) | 0.504 | 0.048 | 0.346 | 0.628 |
| Manganese | Mn (ppm) | 476.712 | 152.810 | 228.795 | 1177.840 |
| Sodium | Na (wt%) | 0.846 | 0.072 | 0.630 | 1.009 |
| Phosphorus | P (wt%) | 0.055 | 0.006 | 0.039 | 0.073 |
| Lead | Pb (ppm) | 16.798 | 2.290 | 11.317 | 26.884 |
| Selenium | Se (ppm) | 0.318 | 0.097 | 0.105 | 0.591 |
| Titanium | Ti (wt%) | 0.272 | 0.013 | 0.223 | 0.307 |
| Zinc | Zn (ppm) | 57.325 | 7.394 | 38.725 | 78.437 |