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| Term | Definition |
|---|---|
| O | Oxygen (46.6%) |
| Si | Silicon (27.7%) |
| Al | Aluminum (8.1%) |
| Fe | Iron (5.0%) |
| Ca | Calcium (3.6%) |
| Na | Sodium (2.8%) |
| K | Potassium (2.6%) |
| Mg | Magnesium (2.1%) |
| Ti | Titanium (about 0.2%) |
| H | Hydrogen (about 0.2%) |
| P | Phosphorus (about 0.2%) |
| Ma | Manganese (about 0.2%) |
| F | Fluorine (about 0.2%) |
| S | Sulfur (about 0.2%) |
| C | Carbon (about 0.2%) |
| He | Helium |
| Ar | Argon |
| N | Nitrogen |
| Cl | Chlorine |
| U | Uranium |