| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.704 | 0.819 | 1.078 | 5.579 |
| Arsenic | As (ppm) | 5.044 | 1.117 | 1.622 | 9.148 |
| Calcium | Ca (wt%) | 1.816 | 1.875 | 0.134 | 9.522 |
| Copper | Cu (ppm) | 5.468 | 2.494 | 1.220 | 14.974 |
| Iron | Fe (wt%) | 1.213 | 0.270 | 0.506 | 2.215 |
| Mercury | Hg (ppm) | 0.015 | 0.005 | 0.010 | 0.041 |
| Magnesium | Mg (wt%) | 0.219 | 0.103 | 0.049 | 0.511 |
| Manganese | Mn (ppm) | 179.695 | 80.208 | 93.902 | 541.041 |
| Sodium | Na (wt%) | 0.241 | 0.132 | 0.041 | 0.757 |
| Phosphorus | P (wt%) | 0.021 | 0.010 | 0.007 | 0.054 |
| Lead | Pb (ppm) | 15.352 | 4.038 | 8.749 | 26.679 |
| Selenium | Se (ppm) | 0.307 | 0.159 | 0.101 | 1.175 |
| Titanium | Ti (wt%) | 0.258 | 0.039 | 0.178 | 0.431 |
| Zinc | Zn (ppm) | 32.591 | 10.546 | 14.207 | 71.078 |