Cordierite (₂MgO·₂Al₂O₃·₅SiO₂),Cordierite (mineralogy) or iolite (gemology) is a magnesium iron aluminium cyclosilicate. (₂MgO·₂Al₂O₃·₅SiO₂),Iron is almost always present and a solid solution exists between Mg-rich cordierite and Fe-rich sekaninaite with a series formula: (Mg,Fe)₂Al₃(Si₅AlO₁₈) to (Fe,Mg)₂Al₃(Si₅AlO₁₈).A high-temperature polymorph exists, indialite, which is isostructural with beryl and has a random distribution of Al in the (Si,Al)₆O₁₈ rings