Chalcopyrite was prepared from precipitates of CuS and FeS in distilled water at room temperature and at 150 degrees C. The resulting chalcopyrite transformed to bornite by holding it at 100 degrees for six days in a copper sulfate solution providing the requisite excess Cu (super ++) ions, and the bornite reconverted to chalcopyrite under similar conditions in the presence of excess Fe (super ++) and S (super =) ions. The significance of the low- temperature synthesis of copper-iron sulfides, and of additional experiments in which the finely divided precipitates were recrystallized at low temperature and high pressure to form coarsely crystalline sulfides, for an understanding of conditions of formation of syngenetic sedimentary ores is noted.

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