Iron Minerals - Geo Studies Organization
Occurrence of Magnetite: ... (2). Hematite: Fe 3 O 4. Physical properties of Hematite: Crystal System: trigonal; ... formed by the oxidation of minerals, such as a siderite, pyrite and magnetite. Goethite is a principal constituent of limonite. Uses of Goethite: Goethite is used as a source of iron. It can also be used as a clay-earth pigment.