| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.452 | 0.891 | 2.011 | 5.166 |
| Arsenic | As (ppm) | 1.034 | 0.187 | 0.589 | 1.494 |
| Calcium | Ca (wt%) | 0.447 | 0.289 | 0.112 | 1.089 |
| Copper | Cu (ppm) | 11.069 | 2.312 | 6.045 | 15.407 |
| Iron | Fe (wt%) | 3.855 | 0.999 | 1.782 | 5.661 |
| Mercury | Hg (ppm) | 0.039 | 0.010 | 0.020 | 0.075 |
| Magnesium | Mg (wt%) | 0.429 | 0.200 | 0.161 | 0.894 |
| Manganese | Mn (ppm) | 709.339 | 97.466 | 485.667 | 933.438 |
| Sodium | Na (wt%) | 0.275 | 0.118 | 0.092 | 0.535 |
| Phosphorus | P (wt%) | 0.018 | 0.004 | 0.010 | 0.030 |
| Lead | Pb (ppm) | 16.502 | 3.707 | 8.157 | 24.927 |
| Selenium | Se (ppm) | 0.118 | 0.011 | 0.100 | 0.150 |
| Titanium | Ti (wt%) | 0.779 | 0.094 | 0.515 | 0.931 |
| Zinc | Zn (ppm) | 62.066 | 12.018 | 30.218 | 76.347 |