We can expect CO₂ and SiO₂ to take analogical forms in nature as carbon and silicon belong to the same group in the periodic table. The macromolecular forms of SiO₂ in nature are very stable. The purpose of the present trial is to find out whether macromolecular forms of CO₂ that are stable can exist in nature. Some evidence and possibilities for this are presented here. If the synthesis routes resulting in those forms are established, we can expect the technology development for the CO₂ fixation to make a breakthrough.