ETYM Greek chalkos brass + Eng. pyrite. So named from its color.
A yellow copper ore (CuFeS2) made up of copper-iron sulfide; SYN. copper pyrites.
Copper iron sulfide, CuFeS2, the most common ore of copper. It is brassy yellow in color and may have an iridescent surface tarnish. It occurs in many different types of mineral vein, in rocks ranging from basalt to limestone.