| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.824 | 0.438 | 2.941 | 5.085 |
| Arsenic | As (ppm) | 3.797 | 0.778 | 1.546 | 5.999 |
| Calcium | Ca (wt%) | 3.174 | 1.215 | 0.686 | 7.297 |
| Copper | Cu (ppm) | 9.248 | 3.074 | 3.173 | 16.782 |
| Iron | Fe (wt%) | 1.459 | 0.243 | 1.052 | 1.931 |
| Mercury | Hg (ppm) | 0.012 | 0.002 | 0.010 | 0.019 |
| Magnesium | Mg (wt%) | 0.471 | 0.183 | 0.231 | 1.214 |
| Manganese | Mn (ppm) | 641.166 | 558.257 | 195.867 | 3217.140 |
| Sodium | Na (wt%) | 0.679 | 0.078 | 0.550 | 1.006 |
| Phosphorus | P (wt%) | 0.033 | 0.008 | 0.020 | 0.056 |
| Lead | Pb (ppm) | 17.913 | 2.268 | 11.544 | 23.339 |
| Selenium | Se (ppm) | 0.376 | 0.160 | 0.103 | 0.877 |
| Titanium | Ti (wt%) | 0.218 | 0.033 | 0.159 | 0.291 |
| Zinc | Zn (ppm) | 28.413 | 5.853 | 17.250 | 43.075 |