| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.934 | 0.399 | 1.377 | 2.712 |
| Arsenic | As (ppm) | 2.521 | 0.548 | 1.207 | 3.379 |
| Calcium | Ca (wt%) | 7.863 | 4.227 | 1.480 | 16.800 |
| Copper | Cu (ppm) | 7.075 | 1.907 | 4.004 | 10.728 |
| Iron | Fe (wt%) | 0.732 | 0.224 | 0.401 | 1.133 |
| Mercury | Hg (ppm) | 0.012 | 0.002 | 0.010 | 0.016 |
| Magnesium | Mg (wt%) | 0.248 | 0.063 | 0.169 | 0.382 |
| Manganese | Mn (ppm) | 146.377 | 21.649 | 103.971 | 189.806 |
| Sodium | Na (wt%) | 0.103 | 0.022 | 0.062 | 0.145 |
| Phosphorus | P (wt%) | 0.013 | 0.005 | 0.005 | 0.023 |
| Lead | Pb (ppm) | 14.342 | 1.850 | 11.158 | 18.074 |
| Selenium | Se (ppm) | 0.183 | 0.062 | 0.100 | 0.350 |
| Titanium | Ti (wt%) | 0.099 | 0.016 | 0.065 | 0.128 |
| Zinc | Zn (ppm) | 14.182 | 5.375 | 6.017 | 23.995 |