Pyrite vs. Chalcopyrite: What’s the Difference?

• Pyrite (noun)

  The common mineral iron disulfide (FeS2), of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system.

• Pyrite (noun)

  (usually as a plural: pyrites) Any metallic-looking sulphide, such as the above, which is the most common.

• Pyrite (noun)

  (usually as a plural: pyrites) Any metal dichalcogenide that is isostructural to the common mineral.

  “Copper diselenide can occur both as a marcasite and a pyrite.”

• Chalcopyrite (noun)

  A yellow CuFeS2.

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