| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.884 | 0.891 | 0.893 | 4.956 |
| Arsenic | As (ppm) | 3.082 | 0.855 | 1.333 | 5.891 |
| Calcium | Ca (wt%) | 2.187 | 0.720 | 0.249 | 4.274 |
| Copper | Cu (ppm) | 7.636 | 2.175 | 3.100 | 13.982 |
| Iron | Fe (wt%) | 1.100 | 0.304 | 0.357 | 1.808 |
| Mercury | Hg (ppm) | 0.014 | 0.004 | 0.010 | 0.030 |
| Magnesium | Mg (wt%) | 0.345 | 0.109 | 0.096 | 0.607 |
| Manganese | Mn (ppm) | 232.002 | 65.717 | 94.621 | 418.378 |
| Sodium | Na (wt%) | 0.255 | 0.123 | 0.112 | 0.724 |
| Phosphorus | P (wt%) | 0.018 | 0.007 | 0.005 | 0.039 |
| Lead | Pb (ppm) | 11.523 | 4.037 | 5.117 | 22.003 |
| Selenium | Se (ppm) | 0.235 | 0.076 | 0.100 | 0.400 |
| Titanium | Ti (wt%) | 0.217 | 0.033 | 0.132 | 0.290 |
| Zinc | Zn (ppm) | 29.475 | 8.595 | 9.430 | 50.943 |