| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 4.055 | 0.375 | 2.807 | 4.703 |
| Arsenic | As (ppm) | 5.002 | 0.967 | 3.258 | 6.679 |
| Calcium | Ca (wt%) | 1.395 | 1.009 | 0.299 | 4.063 |
| Copper | Cu (ppm) | 11.581 | 1.048 | 9.842 | 13.963 |
| Iron | Fe (wt%) | 1.705 | 0.131 | 1.369 | 2.004 |
| Mercury | Hg (ppm) | 0.013 | 0.003 | 0.010 | 0.019 |
| Magnesium | Mg (wt%) | 0.396 | 0.043 | 0.298 | 0.481 |
| Manganese | Mn (ppm) | 269.249 | 59.011 | 159.642 | 376.674 |
| Sodium | Na (wt%) | 0.434 | 0.032 | 0.310 | 0.486 |
| Phosphorus | P (wt%) | 0.030 | 0.004 | 0.018 | 0.039 |
| Lead | Pb (ppm) | 16.331 | 2.566 | 12.191 | 21.351 |
| Selenium | Se (ppm) | 0.157 | 0.029 | 0.100 | 0.241 |
| Titanium | Ti (wt%) | 0.240 | 0.026 | 0.183 | 0.277 |
| Zinc | Zn (ppm) | 43.162 | 6.626 | 23.980 | 54.858 |