| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 4.367 | 0.935 | 2.455 | 5.590 |
| Arsenic | As (ppm) | 3.761 | 0.979 | 1.873 | 8.876 |
| Calcium | Ca (wt%) | 3.987 | 1.268 | 0.865 | 7.980 |
| Copper | Cu (ppm) | 9.169 | 1.061 | 4.771 | 10.473 |
| Iron | Fe (wt%) | 1.581 | 0.385 | 0.548 | 2.118 |
| Mercury | Hg (ppm) | 0.013 | 0.003 | 0.010 | 0.020 |
| Magnesium | Mg (wt%) | 0.575 | 0.106 | 0.322 | 0.787 |
| Manganese | Mn (ppm) | 274.842 | 99.365 | 97.718 | 433.373 |
| Sodium | Na (wt%) | 0.673 | 0.288 | 0.305 | 1.293 |
| Phosphorus | P (wt%) | 0.041 | 0.007 | 0.022 | 0.050 |
| Lead | Pb (ppm) | 16.105 | 3.133 | 9.408 | 24.680 |
| Selenium | Se (ppm) | 0.199 | 0.063 | 0.101 | 0.421 |
| Titanium | Ti (wt%) | 0.256 | 0.067 | 0.137 | 0.391 |
| Zinc | Zn (ppm) | 47.597 | 9.108 | 18.247 | 59.962 |