| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.098 | 0.662 | 0.672 | 3.939 |
| Arsenic | As (ppm) | 4.577 | 1.455 | 1.261 | 8.165 |
| Calcium | Ca (wt%) | 0.911 | 0.933 | 0.078 | 4.091 |
| Copper | Cu (ppm) | 5.567 | 1.918 | 1.283 | 12.375 |
| Iron | Fe (wt%) | 1.081 | 0.273 | 0.513 | 1.852 |
| Mercury | Hg (ppm) | 0.012 | 0.003 | 0.010 | 0.027 |
| Magnesium | Mg (wt%) | 0.169 | 0.111 | 0.032 | 0.690 |
| Manganese | Mn (ppm) | 333.310 | 135.211 | 97.792 | 744.417 |
| Sodium | Na (wt%) | 0.117 | 0.090 | 0.027 | 0.557 |
| Phosphorus | P (wt%) | 0.021 | 0.012 | 0.005 | 0.081 |
| Lead | Pb (ppm) | 12.104 | 2.810 | 6.611 | 21.083 |
| Selenium | Se (ppm) | 0.207 | 0.041 | 0.110 | 0.353 |
| Titanium | Ti (wt%) | 0.203 | 0.035 | 0.124 | 0.340 |
| Zinc | Zn (ppm) | 18.537 | 7.976 | 5.251 | 48.809 |