| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 4.432 | 0.324 | 3.181 | 5.140 |
| Arsenic | As (ppm) | 7.587 | 1.203 | 4.723 | 10.768 |
| Calcium | Ca (wt%) | 0.250 | 0.093 | 0.143 | 0.637 |
| Copper | Cu (ppm) | 8.563 | 1.468 | 4.608 | 12.278 |
| Iron | Fe (wt%) | 2.437 | 0.240 | 1.881 | 3.012 |
| Mercury | Hg (ppm) | 0.031 | 0.006 | 0.020 | 0.045 |
| Magnesium | Mg (wt%) | 0.280 | 0.030 | 0.185 | 0.354 |
| Manganese | Mn (ppm) | 544.954 | 82.942 | 306.379 | 680.874 |
| Sodium | Na (wt%) | 0.440 | 0.046 | 0.350 | 0.562 |
| Phosphorus | P (wt%) | 0.037 | 0.004 | 0.027 | 0.045 |
| Lead | Pb (ppm) | 18.316 | 2.163 | 15.948 | 25.986 |
| Selenium | Se (ppm) | 0.430 | 0.078 | 0.144 | 0.554 |
| Titanium | Ti (wt%) | 0.310 | 0.026 | 0.229 | 0.373 |
| Zinc | Zn (ppm) | 62.862 | 4.519 | 41.382 | 71.324 |