| Element and Symbol | Percentage by weight | Percentage by number of atoms | Percentage by volume |
|---|---|---|---|
| Oxygen (O) | 46.6 | 62.6 | 93.8 |
| Silicon (Si) | 27.7 | 21.2 | 0.9 |
| Aluminum (Al) | 8.1 | 6.5 | 0.5 |
| Iron (Fe) | 5.0 | 1.9 | 0.4 |
| Calcium (Ca) | 3.6 | 1.9 | 1.0 |
| Sodium (Na) | 2.8 | 2.6 | 1.3 |
| Potassium (K) | 2.6 | 1.4 | 1.8 |
| Magnesium (Mg) | 2.1 | 1.9 | 0.3 |
| All other elements | 1.5 | _______ | _______ |
| 100 | 100 | 100 |