| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 5.052 | 0.262 | 4.365 | 5.981 |
| Arsenic | As (ppm) | 5.904 | 1.152 | 4.084 | 12.642 |
| Calcium | Ca (wt%) | 1.891 | 0.809 | 0.758 | 5.639 |
| Copper | Cu (ppm) | 17.861 | 4.329 | 10.328 | 47.011 |
| Iron | Fe (wt%) | 1.963 | 0.118 | 1.678 | 2.293 |
| Mercury | Hg (ppm) | 0.021 | 0.006 | 0.010 | 0.060 |
| Magnesium | Mg (wt%) | 0.735 | 0.211 | 0.495 | 1.895 |
| Manganese | Mn (ppm) | 439.755 | 49.962 | 281.676 | 662.734 |
| Sodium | Na (wt%) | 0.808 | 0.102 | 0.414 | 1.078 |
| Phosphorus | P (wt%) | 0.083 | 0.021 | 0.045 | 0.190 |
| Lead | Pb (ppm) | 22.059 | 5.967 | 13.499 | 69.151 |
| Selenium | Se (ppm) | 0.183 | 0.069 | 0.102 | 0.673 |
| Titanium | Ti (wt%) | 0.255 | 0.011 | 0.200 | 0.280 |
| Zinc | Zn (ppm) | 112.621 | 107.583 | 51.097 | 856.986 |