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a very common mineral, copper iron sulfide, CuFeS 2 , occurring in brass-yellow crystals or masses: the most important ore of copper; copper pyrites.
a very common brass-yellow mineral, iron disulfide, FeS 2 , with a metallic luster, burned to sulfur dioxide in the manufacture of sulfuric acid: chemically similar to marcasite, but crystallizing in the isometric system.
