Dictionary![]() ![]() chal•co•py•ritePronunciation: (kal"ku-pī'rīt), [key] —n. a very common mineral, copper iron sulfide, CuFeS2, occurring in brass-yellow crystals or masses: the most important ore of copper; copper pyrites. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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