bornite

(bôrnīt′)

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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