The common are is chalcopyrite, a copper sulphide; that is, it is composed of copper and sulphur.
"The Western United States" by Harold Wellman Fairbanks
The cobalt ores at these localities occur with pyrites and chalcopyrite as bands in gneiss.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5" by Various
Copper-glance readily alters to other minerals, such as malachite, covellite, melaconite and chalcopyrite.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3" by Various
This has already been mentioned as lying close to the iron ore, and may possibly be metamorphosed chalcopyrite.
"A Report on Washington Territory" by William Henry Ruffner