| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.870 | 0.518 | 2.380 | 5.272 |
| Arsenic | As (ppm) | 3.541 | 0.391 | 1.915 | 4.570 |
| Calcium | Ca (wt%) | 0.654 | 0.163 | 0.272 | 1.071 |
| Copper | Cu (ppm) | 9.492 | 1.926 | 4.225 | 14.164 |
| Iron | Fe (wt%) | 1.735 | 0.217 | 1.004 | 2.226 |
| Mercury | Hg (ppm) | 0.010 | 0.001 | 0.010 | 0.016 |
| Magnesium | Mg (wt%) | 0.457 | 0.100 | 0.195 | 0.777 |
| Manganese | Mn (ppm) | 392.092 | 62.683 | 256.499 | 547.845 |
| Sodium | Na (wt%) | 0.564 | 0.080 | 0.361 | 0.743 |
| Phosphorus | P (wt%) | 0.027 | 0.003 | 0.021 | 0.035 |
| Lead | Pb (ppm) | 15.655 | 1.473 | 9.416 | 19.946 |
| Selenium | Se (ppm) | 0.108 | 0.013 | 0.100 | 0.172 |
| Titanium | Ti (wt%) | 0.254 | 0.024 | 0.206 | 0.306 |
| Zinc | Zn (ppm) | 30.973 | 3.117 | 18.796 | 39.637 |