| Chemical Analysis | |
| L . O. I | 5 ± 1 |
| SiO₂ | 72 ± 2 |
| Al₂O₃ | 15 ± 1 |
| Fe₂O₃ | 1.3 ± 0.3 |
| TiO₂ | 0.2 ± 0.1 |
| CaO | 2 ± 0.5 |
| MgO | 0.4 ± 0.2 |
| Na₂O | 3 ± 0.5 |
| K₂O | 2 ± 0.5 |
| Sulfur | Trace |
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