peacock copper

English

Etymology

After the rainbow iridescence that appears after tarnishing.

Noun

peacock copper (uncountable)

  1. (informal) Bornite.
    • 1920, Douglas Clermont Livingston, The Copper Deposits of the Seven Devils and Adjacent Districts:
      The ores are of two general types, chalcopyrite or “yellow copper,” with very little bornite or other minerals richer in copper, and those in which the values lie almost wholly in bornite or “peacock copper.”

Synonyms
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