bornite

from WordNet (r) 3.0 (2006)

bornite
    n 1: a mineral consisting of sulfides of copper and iron that is
         found in copper deposits [syn: {bornite}, {peacock ore}]

from The Collaborative International Dictionary of English v.0.48

Bornite \Bor"nite\, n. [Named after Von Born, a mineralogist.]
   (Min.)
   A valuable ore of copper, containing copper, iron, and
   sulphur; -- also called {purple copper ore} (or
   {erubescite}), in allusion to the colors shown upon the
   slightly tarnished surface.
   [1913 Webster]