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Magnetite And Pyrite Cloudo

When bituminous coal is heated in an inert atmosphere He containing small amounts of oxygen at 393-455 C pyrite FeS2 in coal is partially converted to magnetite Fe304. The maximum amount of Fe304 formed during the time of heating corresponds to 5-20 of the total pyrite present depending on the coal sample. The magnetite forms as an outer crust on the pyrite grains.

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