Formation of Fayalite in Roast Reduced Jaspilite

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A MAGNETIZING roasting treatment of a fine-grained hæmatite-quartzite known as jaspilite, occurring in South Australia, is at present being evaluated1. When heated in reducing gases at appropriate temperatures, 550–650° C., the hæmatite in jaspilite is converted to magnetite. Extensive microcracking also occurs in the quartz matrix (Fig. 1A). This cracking allows freer access of reducing gases to the hæmatite particles undergoing reduction and facilitates grinding prior to magnetic concentration2.

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LEAN, J., TUCKER, K., HOLLAND, B. et al. Formation of Fayalite in Roast Reduced Jaspilite. Nature 187, 683–684 (1960) doi:10.1038/187683c0

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