| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 4.669 | 0.564 | 3.038 | 6.853 |
| Arsenic | As (ppm) | 12.111 | 2.463 | 4.898 | 25.272 |
| Calcium | Ca (wt%) | 0.227 | 0.059 | 0.066 | 0.542 |
| Copper | Cu (ppm) | 13.076 | 2.837 | 7.232 | 27.282 |
| Iron | Fe (wt%) | 2.948 | 0.391 | 2.045 | 5.083 |
| Mercury | Hg (ppm) | 0.037 | 0.014 | 0.010 | 0.106 |
| Magnesium | Mg (wt%) | 0.465 | 0.060 | 0.277 | 0.655 |
| Manganese | Mn (ppm) | 681.625 | 78.108 | 417.884 | 961.089 |
| Sodium | Na (wt%) | 0.600 | 0.104 | 0.197 | 0.826 |
| Phosphorus | P (wt%) | 0.057 | 0.006 | 0.032 | 0.076 |
| Lead | Pb (ppm) | 22.352 | 3.250 | 16.029 | 34.993 |
| Selenium | Se (ppm) | 0.150 | 0.035 | 0.100 | 0.290 |
| Titanium | Ti (wt%) | 0.303 | 0.033 | 0.196 | 0.396 |
| Zinc | Zn (ppm) | 68.755 | 7.636 | 47.616 | 91.539 |