DCHP-1 Online
peacock copper 
bornite, a copper-iron sulphide with a purplish tarnish, as in peacock feathers.
- 1897 The Michigan claim on Toad mountain is showing up well, some very fine gray copper and peacock copper having been encountered which give promise of good returns.
- 1912 Once a week I take my little pack outfit up to the Sky-line claim for a load of peacock copper. It runs three hundred dollars to the ton in horn silver, and looks more like jewels than mineral.
- 1897 The Michigan claim on Toad mountain is showing up well, some very fine gray copper and peacock copper having been encountered which give promise of good returns.