| Soil composition | Ref. [1] | This work | Air composition | Ref. [1] & this work |
| SiO2 | 58.3% | 100% | N2 | 75.5 |
| Al2O3 | 16.7% | -- | O2 | 23.2 |
| Fe2O3 | 8.3% | -- | Ar | 1.3 |
| H2O | 16.7% | -- | ||
| Density (g·cm−3) | 1 | 1.6 | 0.0012 |