| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.933 | 0.479 | 3.206 | 5.676 |
| Arsenic | As (ppm) | 7.157 | 1.185 | 3.897 | 9.176 |
| Calcium | Ca (wt%) | 0.314 | 0.065 | 0.169 | 0.506 |
| Copper | Cu (ppm) | 9.076 | 1.739 | 5.691 | 14.186 |
| Iron | Fe (wt%) | 1.318 | 0.230 | 0.882 | 2.286 |
| Mercury | Hg (ppm) | 0.034 | 0.010 | 0.013 | 0.082 |
| Magnesium | Mg (wt%) | 0.242 | 0.077 | 0.123 | 0.570 |
| Manganese | Mn (ppm) | 431.248 | 122.720 | 143.435 | 706.819 |
| Sodium | Na (wt%) | 0.646 | 0.089 | 0.474 | 0.842 |
| Phosphorus | P (wt%) | 0.034 | 0.005 | 0.020 | 0.049 |
| Lead | Pb (ppm) | 16.673 | 2.248 | 12.851 | 26.720 |
| Selenium | Se (ppm) | 0.313 | 0.069 | 0.139 | 0.532 |
| Titanium | Ti (wt%) | 0.269 | 0.016 | 0.224 | 0.302 |
| Zinc | Zn (ppm) | 37.341 | 7.061 | 23.391 | 60.669 |