| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.455 | 0.639 | 0.882 | 4.012 |
| Arsenic | As (ppm) | 3.798 | 1.066 | 1.522 | 6.835 |
| Calcium | Ca (wt%) | 1.062 | 0.846 | 0.208 | 4.368 |
| Copper | Cu (ppm) | 8.624 | 2.457 | 2.499 | 15.901 |
| Iron | Fe (wt%) | 1.083 | 0.408 | 0.218 | 2.163 |
| Mercury | Hg (ppm) | 0.010 | 0.001 | 0.010 | 0.014 |
| Magnesium | Mg (wt%) | 0.225 | 0.049 | 0.072 | 0.449 |
| Manganese | Mn (ppm) | 407.870 | 208.725 | 146.230 | 2006.930 |
| Sodium | Na (wt%) | 0.257 | 0.104 | 0.098 | 0.585 |
| Phosphorus | P (wt%) | 0.016 | 0.006 | 0.005 | 0.034 |
| Lead | Pb (ppm) | 8.284 | 2.529 | 2.712 | 17.495 |
| Selenium | Se (ppm) | 0.166 | 0.074 | 0.100 | 0.829 |
| Titanium | Ti (wt%) | 0.177 | 0.048 | 0.058 | 0.293 |
| Zinc | Zn (ppm) | 20.083 | 7.750 | 3.958 | 35.756 |