| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 5.077 | 0.527 | 4.038 | 7.102 |
| Arsenic | As (ppm) | 8.356 | 2.393 | 4.423 | 16.996 |
| Calcium | Ca (wt%) | 4.640 | 1.897 | 1.592 | 11.723 |
| Copper | Cu (ppm) | 16.505 | 3.393 | 9.814 | 26.530 |
| Iron | Fe (wt%) | 2.239 | 0.328 | 1.494 | 3.465 |
| Mercury | Hg (ppm) | 0.011 | 0.003 | 0.010 | 0.025 |
| Magnesium | Mg (wt%) | 1.783 | 0.238 | 1.283 | 2.562 |
| Manganese | Mn (ppm) | 314.848 | 34.484 | 228.277 | 424.618 |
| Sodium | Na (wt%) | 0.721 | 0.231 | 0.369 | 1.446 |
| Phosphorus | P (wt%) | 0.043 | 0.007 | 0.027 | 0.064 |
| Lead | Pb (ppm) | 26.601 | 5.515 | 13.975 | 38.129 |
| Selenium | Se (ppm) | 0.369 | 0.169 | 0.107 | 0.878 |
| Titanium | Ti (wt%) | 0.253 | 0.028 | 0.199 | 0.383 |
| Zinc | Zn (ppm) | 43.396 | 6.285 | 27.921 | 65.498 |