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Natural iron oxides occur extensively and are obtained from deposit of various types. Hematite is mainly sourced from iron ore of sedimentary origin inclusive hydrothermal, metamorphic and volcanic deposits. Mafic and ultramafic rocks are linked with magnetite. This is also associated with skarn-type metamorphic deposits. Products of weathering such as limonite, ochre, sienna, umber and goethite exist in gossans. In addition, they are obtained from sulphide minerals and other iron-rich rocks 8.Free quote