enargite
noun
en·ar·gite
ə̇ˈnärˌjīt,
ˈenər-
plural -s
: a grayish black or iron-black copper arsenic sulfide (Cu3AsS4) of metallic luster occurring in small orthorhombic crystals or massive and often containing antimony
Word History
Etymology
German enargit, from Greek enargēs visible (from en in + argēs bright) + German -it -ite; from its cleavage; akin to Greek argos white