In India we get four types of iron ores, viz. (a) hematite (Fe 2 0 3), magnetite (limonite (2Fe 2 0 3.3H 2 0), and siderite (Fe 2 C0 3). The hematite ore or red-ochre is called ‘ox ide of iron’. It has ferrous content ranging from 60 to 70%. It is mainly found in the Dharwad and Cuddapah rocks of the Peninsular India.