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![Examples of compositions of various types of glasses: natural [26],... | Download Scientific Diagram](https://www.researchgate.net/publication/258130093/figure/fig2/AS:667689571848197@1536201007227/Examples-of-compositions-of-various-types-of-glasses-natural-26-vitrifi-ed-forts-in.png "Examples of compositions of various types of glasses: natural [26],... | Download Scientific Diagram")