| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.122 | 0.624 | 0.845 | 4.843 |
| Arsenic | As (ppm) | 3.472 | 0.773 | 1.670 | 5.979 |
| Calcium | Ca (wt%) | 1.717 | 1.130 | 0.191 | 5.312 |
| Copper | Cu (ppm) | 8.012 | 1.934 | 1.304 | 13.683 |
| Iron | Fe (wt%) | 1.204 | 0.268 | 0.263 | 1.780 |
| Mercury | Hg (ppm) | 0.020 | 0.017 | 0.010 | 0.164 |
| Magnesium | Mg (wt%) | 0.413 | 0.148 | 0.040 | 0.890 |
| Manganese | Mn (ppm) | 231.856 | 49.843 | 106.614 | 328.100 |
| Sodium | Na (wt%) | 0.352 | 0.038 | 0.179 | 0.500 |
| Phosphorus | P (wt%) | 0.023 | 0.007 | 0.006 | 0.043 |
| Lead | Pb (ppm) | 11.563 | 2.321 | 7.124 | 20.589 |
| Selenium | Se (ppm) | 0.154 | 0.041 | 0.100 | 0.291 |
| Titanium | Ti (wt%) | 0.236 | 0.049 | 0.047 | 0.380 |
| Zinc | Zn (ppm) | 33.099 | 7.060 | 6.239 | 47.277 |