| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.785 | 0.353 | 2.423 | 4.672 |
| Arsenic | As (ppm) | 5.312 | 0.837 | 3.102 | 7.238 |
| Calcium | Ca (wt%) | 2.263 | 1.687 | 0.298 | 9.026 |
| Copper | Cu (ppm) | 12.414 | 1.610 | 7.015 | 16.324 |
| Iron | Fe (wt%) | 1.617 | 0.162 | 1.101 | 2.125 |
| Mercury | Hg (ppm) | 0.013 | 0.005 | 0.010 | 0.030 |
| Magnesium | Mg (wt%) | 0.419 | 0.102 | 0.242 | 0.761 |
| Manganese | Mn (ppm) | 258.097 | 41.549 | 157.712 | 451.159 |
| Sodium | Na (wt%) | 0.465 | 0.058 | 0.242 | 0.582 |
| Phosphorus | P (wt%) | 0.029 | 0.012 | 0.015 | 0.100 |
| Lead | Pb (ppm) | 16.204 | 3.810 | 11.208 | 32.086 |
| Selenium | Se (ppm) | 0.110 | 0.026 | 0.100 | 0.313 |
| Titanium | Ti (wt%) | 0.228 | 0.016 | 0.160 | 0.273 |
| Zinc | Zn (ppm) | 52.187 | 5.501 | 38.926 | 68.835 |