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enargite

noun
en·​ar·​gite | \ə̇ˈnärˌjīt, ˈenər-\
plural -s

Definition of enargite 

: a grayish black or iron-black copper arsenic sulfide (Cu3AsS4) of metallic luster occurring in small orthorhombic crystals or massive and often containing antimony

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History and Etymology for enargite

German enargit, from Greek enargēs visible (from en in + argēs bright) + German -it -ite; from its cleavage; akin to Greek argos white

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