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K2O SiO2
(a): SiO2 vs. Na2O + K2O variation diagram [30]. (b) R1 -R2 binary ...
![(a): SiO2 vs. Na2O + K2O variation diagram [30]. (b) R1 -R2 binary ...](https://www.researchgate.net/publication/312925231/figure/fig3/AS:455340241231874@1485572981705/a-SiO2-vs-Na2O-K2O-variation-diagram-30-b-R1-R2-binary-diagram-31-R1-4Si.png)