| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.978 | 0.345 | 0.814 | 3.003 |
| Arsenic | As (ppm) | 3.603 | 0.806 | 1.227 | 8.346 |
| Calcium | Ca (wt%) | 0.334 | 0.081 | 0.138 | 0.615 |
| Copper | Cu (ppm) | 5.306 | 1.917 | 1.152 | 10.978 |
| Iron | Fe (wt%) | 1.101 | 0.162 | 0.591 | 1.465 |
| Mercury | Hg (ppm) | 0.010 | 0.001 | 0.010 | 0.023 |
| Magnesium | Mg (wt%) | 0.218 | 0.042 | 0.083 | 0.297 |
| Manganese | Mn (ppm) | 343.501 | 139.268 | 145.937 | 969.965 |
| Sodium | Na (wt%) | 0.186 | 0.036 | 0.032 | 0.280 |
| Phosphorus | P (wt%) | 0.014 | 0.002 | 0.006 | 0.023 |
| Lead | Pb (ppm) | 9.284 | 1.905 | 2.908 | 15.798 |
| Selenium | Se (ppm) | 0.110 | 0.021 | 0.100 | 0.281 |
| Titanium | Ti (wt%) | 0.182 | 0.028 | 0.120 | 0.370 |
| Zinc | Zn (ppm) | 18.254 | 2.493 | 11.739 | 27.733 |