Abstract

Abstract Microscope and thermal analyses of material from various mineralized zones of the oolitic iron ore formation of Moulaine in the Longwy basin, France, reveal the presence of francolite, abundant kaolinite, and detrital quartz accompanied by mica, feldspar, and zircon. The ores were formed in a silica- and aluminum-rich carbonate milieu; the iron was concentrated almost completely in the oolites, in the form of a gel.

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