| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.719 | 0.310 | 1.583 | 3.346 |
| Arsenic | As (ppm) | 4.072 | 1.007 | 1.990 | 6.205 |
| Calcium | Ca (wt%) | 1.490 | 0.373 | 0.422 | 2.771 |
| Copper | Cu (ppm) | 6.229 | 1.369 | 1.485 | 11.846 |
| Iron | Fe (wt%) | 1.041 | 0.125 | 0.462 | 1.328 |
| Mercury | Hg (ppm) | 0.011 | 0.002 | 0.010 | 0.023 |
| Magnesium | Mg (wt%) | 0.327 | 0.046 | 0.146 | 0.457 |
| Manganese | Mn (ppm) | 211.217 | 33.174 | 89.622 | 277.813 |
| Sodium | Na (wt%) | 0.374 | 0.156 | 0.165 | 0.678 |
| Phosphorus | P (wt%) | 0.015 | 0.002 | 0.008 | 0.020 |
| Lead | Pb (ppm) | 12.281 | 2.721 | 6.124 | 21.595 |
| Selenium | Se (ppm) | 0.141 | 0.032 | 0.100 | 0.210 |
| Titanium | Ti (wt%) | 0.215 | 0.017 | 0.145 | 0.268 |
| Zinc | Zn (ppm) | 26.656 | 2.807 | 13.912 | 35.420 |