| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 4.428 | 0.526 | 3.593 | 5.891 |
| Arsenic | As (ppm) | 7.309 | 2.057 | 4.056 | 13.739 |
| Calcium | Ca (wt%) | 0.441 | 0.152 | 0.260 | 0.773 |
| Copper | Cu (ppm) | 14.228 | 2.656 | 10.611 | 21.314 |
| Iron | Fe (wt%) | 1.530 | 0.310 | 1.105 | 2.389 |
| Mercury | Hg (ppm) | 0.039 | 0.004 | 0.029 | 0.048 |
| Magnesium | Mg (wt%) | 0.321 | 0.108 | 0.189 | 0.616 |
| Manganese | Mn (ppm) | 472.539 | 67.105 | 318.611 | 619.930 |
| Sodium | Na (wt%) | 0.619 | 0.050 | 0.525 | 0.757 |
| Phosphorus | P (wt%) | 0.041 | 0.005 | 0.030 | 0.053 |
| Lead | Pb (ppm) | 24.353 | 7.011 | 15.609 | 48.755 |
| Selenium | Se (ppm) | 0.464 | 0.045 | 0.308 | 0.571 |
| Titanium | Ti (wt%) | 0.294 | 0.027 | 0.236 | 0.346 |
| Zinc | Zn (ppm) | 51.852 | 10.599 | 34.177 | 79.588 |