| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.546 | 0.451 | 1.393 | 3.526 |
| Arsenic | As (ppm) | 5.064 | 2.310 | 1.826 | 14.275 |
| Calcium | Ca (wt%) | 1.091 | 0.733 | 0.169 | 4.834 |
| Copper | Cu (ppm) | 5.288 | 1.342 | 1.217 | 9.599 |
| Iron | Fe (wt%) | 1.211 | 0.196 | 0.651 | 1.890 |
| Mercury | Hg (ppm) | 0.015 | 0.004 | 0.010 | 0.030 |
| Magnesium | Mg (wt%) | 0.204 | 0.054 | 0.100 | 0.342 |
| Manganese | Mn (ppm) | 249.765 | 80.070 | 118.870 | 604.506 |
| Sodium | Na (wt%) | 0.131 | 0.034 | 0.062 | 0.259 |
| Phosphorus | P (wt%) | 0.013 | 0.003 | 0.005 | 0.025 |
| Lead | Pb (ppm) | 14.878 | 4.538 | 6.159 | 27.839 |
| Selenium | Se (ppm) | 0.290 | 0.158 | 0.102 | 1.019 |
| Titanium | Ti (wt%) | 0.276 | 0.032 | 0.194 | 0.433 |
| Zinc | Zn (ppm) | 25.387 | 4.677 | 11.981 | 37.293 |