| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.005 | 0.795 | 1.362 | 5.388 |
| Arsenic | As (ppm) | 3.151 | 0.706 | 1.387 | 6.773 |
| Calcium | Ca (wt%) | 0.904 | 0.562 | 0.266 | 3.285 |
| Copper | Cu (ppm) | 5.907 | 2.116 | 1.419 | 9.972 |
| Iron | Fe (wt%) | 1.040 | 0.293 | 0.505 | 1.781 |
| Mercury | Hg (ppm) | 0.013 | 0.005 | 0.010 | 0.030 |
| Magnesium | Mg (wt%) | 0.481 | 0.250 | 0.151 | 1.414 |
| Manganese | Mn (ppm) | 224.696 | 76.199 | 101.332 | 481.537 |
| Sodium | Na (wt%) | 0.623 | 0.134 | 0.331 | 0.992 |
| Phosphorus | P (wt%) | 0.025 | 0.011 | 0.010 | 0.060 |
| Lead | Pb (ppm) | 12.538 | 3.254 | 5.539 | 18.729 |
| Selenium | Se (ppm) | 0.162 | 0.046 | 0.100 | 0.296 |
| Titanium | Ti (wt%) | 0.175 | 0.038 | 0.101 | 0.272 |
| Zinc | Zn (ppm) | 20.081 | 7.072 | 8.885 | 40.751 |