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bornite
(bôr′nīt′)
noun
a reddish-brown, soft, brittle, cubic mineral, copper iron sulfide, CuFeS, an ore of copper that tarnishes to a dark purplish color when it is fractured
Origin: after Ignaz von Born (1742-91), Austrian metallurgist
See bornite in American Heritage Dictionary 4
noun
A brownish-bronze, lustrous copper ore with the composition Cu5FeS4 that tarnishes to purple when exposed to air.
Origin:
Origin: After Ignaz von Born (1742-1791), Austrian mineralogist
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