Utilizing cultures of sulfate-reducing bacteria in artificial sea water and hydrogen or lactate media, ferrous sulfide was prepared from metallic iron, covellite from malachite and from chrysocolla, digenite from cuprous oxide, galena from lead carbonate, argentite from silver chloride and silver carbonate, and sphalerite from smithsonite and metallic zinc. Black sulfides, but no identifiable minerals, were yielded by nickel and cobalt salts. Rhodochrosite and mercuric carbonate did not yield sulfides, and neither bornite nor chalcopyrite could be obtained from mixtures of iron and copper oxides.

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