| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 4.276 | 0.358 | 3.409 | 5.629 |
| Arsenic | As (ppm) | 5.476 | 0.338 | 4.264 | 6.080 |
| Calcium | Ca (wt%) | 5.203 | 0.732 | 3.516 | 7.465 |
| Copper | Cu (ppm) | 15.780 | 2.590 | 11.201 | 24.795 |
| Iron | Fe (wt%) | 1.845 | 0.225 | 1.433 | 2.762 |
| Mercury | Hg (ppm) | 0.016 | 0.006 | 0.010 | 0.031 |
| Magnesium | Mg (wt%) | 0.672 | 0.177 | 0.445 | 1.539 |
| Manganese | Mn (ppm) | 354.487 | 36.400 | 248.768 | 417.915 |
| Sodium | Na (wt%) | 0.493 | 0.049 | 0.349 | 0.614 |
| Phosphorus | P (wt%) | 0.052 | 0.009 | 0.028 | 0.089 |
| Lead | Pb (ppm) | 16.698 | 1.481 | 13.602 | 24.830 |
| Selenium | Se (ppm) | 0.173 | 0.047 | 0.101 | 0.334 |
| Titanium | Ti (wt%) | 0.252 | 0.014 | 0.218 | 0.280 |
| Zinc | Zn (ppm) | 70.914 | 15.996 | 40.233 | 108.619 |