Hardness Of Limonite Iron Ore On Mohs Hardness Scale
The high-grade ores is characterised by an average of 67.0 Fe with low P, Al2O3, and SiO2, which are concentrated in the fines. Iron-rich itabirites average 58.6 Fe and 13.5 SiO2. The soft high-grade ores and iron-rich itabirites are interpreted to have been the result of supergene processes whereby ground water leached the gangue minerals.
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