(n) :
(mineralogy) A reddish mineral that tarnishes on exposure to air; it is a mixed sulfide of iron and copper with the chemical formula Cu₅FeS and is an important ore of copper.
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(n) :
(mineralogy) A reddish mineral that tarnishes on exposure to air; it is a mixed sulfide of iron and copper with the chemical formula Cu₅FeS and is an important ore of copper.