| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.251 | 0.116 | 0.086 | 0.683 |
| Arsenic | As (ppm) | 1.154 | 0.409 | 0.362 | 3.356 |
| Calcium | Ca (wt%) | 1.866 | 2.807 | 0.030 | 20.288 |
| Copper | Cu (ppm) | 2.585 | 2.036 | 1.041 | 16.207 |
| Iron | Fe (wt%) | 0.201 | 0.118 | 0.059 | 0.999 |
| Mercury | Hg (ppm) | 0.012 | 0.003 | 0.010 | 0.026 |
| Magnesium | Mg (wt%) | 0.120 | 0.223 | 0.007 | 1.697 |
| Manganese | Mn (ppm) | 34.758 | 15.327 | 9.023 | 139.952 |
| Sodium | Na (wt%) | 0.030 | 0.043 | 0.003 | 0.366 |
| Phosphorus | P (wt%) | 0.011 | 0.006 | 0.003 | 0.036 |
| Lead | Pb (ppm) | 4.672 | 1.623 | 2.099 | 9.610 |
| Selenium | Se (ppm) | 0.112 | 0.016 | 0.100 | 0.178 |
| Titanium | Ti (wt%) | 0.153 | 0.042 | 0.064 | 0.268 |
| Zinc | Zn (ppm) | 10.974 | 6.851 | 1.221 | 50.490 |