Magnetite Fe+2Fe2+3O4GoethiteGoethiteBoethite FeO[OH]Boethite FeO[OH]Ferrocolumbite FeNb2O6Ferrocolumbite FeNb2O6Chalcedony variety Carnelian SiO2Chalcedony variety Carnelian SiO2Magnetite Fe+2Fe2+3O4Magnetite Fe+2Fe2+3O4Chalcedony variety Carnelian SiO2Chalcedony variety Carnelian SiO2

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