bornite

[bawr-nahyt]
noun
a common mineral and important ore of copper, copper iron sulfide, Cu 5 FeS 4 , occurring in masses, of brownish color when first exposed to the air; peacock ore.

Origin:
1850–55; named after I. von Born (1742–91), Austrian mineralogist; see -ite1

bornitic [bawr-nit-ik] , adjective
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bornite (ˈbɔːnaɪt)
 
n
Also called: peacock ore a mineral consisting of a sulphide of copper and iron that tarnishes to purple or dark red. It occurs in copper deposits. Formula: Cu5FeS4
 
[C19: named after I. von Born (1742--91), Austrian mineralogist; see -ite1]

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Example sentences
Bornite and chalcocite mineralization in quartz is also present.
The ore from the mine, primarily chalcopyrite with some bornite, was extracted
  from quartz fissure veins in sandy slates.
Most of the outcrop samples contain disseminated pyrite, chalcopyrite, and
  bornite.
B veins characteristically contain molybdenite-chalcopyrite and traces of
  bornite in some of the veins.
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