page_title: Cordierite
hierarchical_section_title: Cordierite
caption_attribution_description: English: Crystal structure of cordierite. Green: magnesium atoms, blue: oxygen atoms, yellow: silicon &amp; aluminium atoms.
context_page_description: Cordierite or iolite is a magnesium iron aluminium cyclosilicate. 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 to (Fe, Mg)₂Al₃. A high-temperature polymorph exists, indialite, which is isostructural with beryl and has a random distribution of Al in the (Si, Al)₆O₁₈ rings.
context_section_description: Cordierite (mineralogy) or iolite (gemology) is a magnesium iron aluminium cyclosilicate. 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.
caption: Crystal structure of Cordierite. Green - Mg or Fe, blue - O, yellow - Si & Al.
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