| Oxide | A-2, Soil | A-4, Soil | A-5, Soil | A-3, Rock "Barnacle Bill" |
A-7, Rock "Yogi" |
|---|---|---|---|---|---|
| weight % | weight % | weight % | weight % | weight % | |
| Na2O | 4.3 | 5.1 | 3.6 | 4.2 | 2.5 |
| MgO | 8.7 | 9.0 | 8.6 | 3.1 | 6.3 |
| Al2O3 | 8.0 | 10.4 | 10.1 | 12.4 | 11.4 |
| SiO2 | 46.1 | 43.3 | 43.8 | 55.0 | 50.9 |
| SO3 | 4.3 | 6.2 | 5.4 | 2.2 | 4.2 |
| K2O | 0.6 | 0.7 | 0.7 | 1.4 | 1.1 |
| CaO | 6.3 | 4.8 | 5.3 | 4.6 | 5.8 |
| TiO2 | 1.1 | 1.1 | 0.7 | 0.7 | 0.8 |
| MnO | 0.5 | 0.5 | 0.6 | 0.9 | 0.5 |
| FeO | 19.5 | 14.5 | 17.5 | 12.7 | 13.8 |