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Chemical composition | Mass percentage |
SiO2 | 52−58 |
Al2O3 | 14−19 |
CaO | 5−9 |
MgO | 3.0−6 |
Na2O, K20 | 3−6 |
TiO2 | 0.5−2.5 |
Fe2O3, FeO | 9.0−14.0 |
Other | 0.09−0.13 |