| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.010 | 0.401 | 1.347 | 3.586 |
| Arsenic | As (ppm) | 2.361 | 0.602 | 1.490 | 4.212 |
| Calcium | Ca (wt%) | 4.325 | 4.049 | 0.238 | 16.551 |
| Copper | Cu (ppm) | 7.394 | 3.226 | 3.450 | 24.922 |
| Iron | Fe (wt%) | 0.777 | 0.198 | 0.494 | 1.523 |
| Mercury | Hg (ppm) | 0.011 | 0.001 | 0.010 | 0.020 |
| Magnesium | Mg (wt%) | 0.224 | 0.051 | 0.114 | 0.388 |
| Manganese | Mn (ppm) | 200.209 | 36.036 | 96.168 | 299.569 |
| Sodium | Na (wt%) | 0.131 | 0.016 | 0.087 | 0.195 |
| Phosphorus | P (wt%) | 0.019 | 0.012 | 0.006 | 0.059 |
| Lead | Pb (ppm) | 12.261 | 2.642 | 7.289 | 24.758 |
| Selenium | Se (ppm) | 0.162 | 0.079 | 0.100 | 0.494 |
| Titanium | Ti (wt%) | 0.122 | 0.014 | 0.084 | 0.179 |
| Zinc | Zn (ppm) | 16.394 | 6.356 | 8.111 | 40.807 |