Iron ores

Iron ores are naturally occurring rocks and minerals from which metallic iron can be extracted. In crystallography, iron ores commonly occur in crystalline forms such as hematite (Fe₂O₃), magnetite (Fe₃O₄), goethite (FeO·OH), and siderite (FeCO₃). Hematite crystallizes in the trigonal system, magnetite in the isometric system, and _____ ___ __________ __________ _______ __________ _________ __________ ________.
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