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| Chemical composition (%) | SiO2 | Al2O3 | Fe2O3 | MgO | CaO | Na2O | K2O | Others |
|---|---|---|---|---|---|---|---|---|
| M = 60.09 | M = 101.95 | M = 159.79 | M = 40.32 | M = 56.08 | M = 61.99 | M = 94.20 | — | |
| 74.56 | 16.45 | 2.62 | 3.10 | 1.50 | 1.30 | 0.18 | 0.29 |
