Calcopyrite is a copper iron sulfide mineral that crystallizes in the tetragonal system. It has the chemical formula CuFeS2. It has a brassy to golden yellow color and a hardness of 3.5 to 4 on the Mohs scale. Metaphysical: Chalcopyrite has a positive vibration that is known to increase happiness, joy and belief in yourself, and like most gold stones it is a stone of abundance.