| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.349 | 0.554 | 0.809 | 3.677 |
| Arsenic | As (ppm) | 3.613 | 0.926 | 1.212 | 8.356 |
| Calcium | Ca (wt%) | 0.469 | 0.227 | 0.138 | 1.232 |
| Copper | Cu (ppm) | 6.070 | 2.038 | 1.173 | 10.604 |
| Iron | Fe (wt%) | 1.110 | 0.210 | 0.589 | 1.682 |
| Mercury | Hg (ppm) | 0.010 | 0.000 | 0.010 | 0.010 |
| Magnesium | Mg (wt%) | 0.300 | 0.125 | 0.084 | 0.779 |
| Manganese | Mn (ppm) | 314.752 | 50.573 | 167.901 | 454.020 |
| Sodium | Na (wt%) | 0.286 | 0.126 | 0.032 | 0.619 |
| Phosphorus | P (wt%) | 0.024 | 0.007 | 0.006 | 0.040 |
| Lead | Pb (ppm) | 12.977 | 3.527 | 2.908 | 20.927 |
| Selenium | Se (ppm) | 0.130 | 0.026 | 0.100 | 0.198 |
| Titanium | Ti (wt%) | 0.186 | 0.030 | 0.119 | 0.371 |
| Zinc | Zn (ppm) | 22.006 | 4.212 | 14.043 | 36.237 |