| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.444 | 0.201 | 2.823 | 4.162 |
| Arsenic | As (ppm) | 3.568 | 0.638 | 1.998 | 5.792 |
| Calcium | Ca (wt%) | 3.823 | 0.976 | 1.854 | 6.766 |
| Copper | Cu (ppm) | 6.988 | 1.112 | 4.396 | 9.233 |
| Iron | Fe (wt%) | 1.407 | 0.170 | 1.004 | 2.068 |
| Mercury | Hg (ppm) | 0.011 | 0.003 | 0.010 | 0.028 |
| Magnesium | Mg (wt%) | 0.371 | 0.048 | 0.254 | 0.503 |
| Manganese | Mn (ppm) | 267.304 | 51.128 | 146.821 | 424.438 |
| Sodium | Na (wt%) | 0.630 | 0.064 | 0.491 | 0.813 |
| Phosphorus | P (wt%) | 0.023 | 0.004 | 0.015 | 0.030 |
| Lead | Pb (ppm) | 15.200 | 1.124 | 12.158 | 18.986 |
| Selenium | Se (ppm) | 0.145 | 0.040 | 0.100 | 0.355 |
| Titanium | Ti (wt%) | 0.196 | 0.020 | 0.159 | 0.278 |
| Zinc | Zn (ppm) | 26.842 | 4.049 | 18.566 | 37.397 |