Geopolymerization forms aluminosilicate frameworks which are similar to those of rock-forming minerals. Yet there are major differences. At low temperature, generally below 300°C, geopolymers contain hydroxyl groups -OH as well as bounded water (so-called zeolitic water), and the structures shown in the figure below must be edited accordingly, with the exception of the sodalite framework. After dehydroxylation (and dehydration), generally above 500°C, geopolymers are becoming more and more crystalline with X-rays diffraction patterns and framework structures identical to their geological analogues.
