Table 4.
Major and minor elemental composition (%).
| SiO2 | TiO2 | Al2O3 | Fe2O3 | MnO | MgO | CaO | Na2O | K2O | P2O5 |
|---|---|---|---|---|---|---|---|---|---|
| 52.48 | 0.627 | 14.62 | 6.64 | 0.125 | 2.985 | 1.53 | 0.707 | 1.24 | 0.034 |
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