enargite

American  

[en-ahr-jahyt, en-er-jahyt] / ɛnˈɑr dʒaɪt, ˈɛn ərˌdʒaɪt /

noun

1. a mineral, copper arsenic and sulfide, Cu 3 AsS 4 , occurring in the form of black orthorhombic crystals having perfect cleavage: an important source of copper.

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Etymology

Origin of enargite

1850–55; < Greek enarg ( ḗs ) brilliant ( en- en- ² + -argēs, akin to argós bright, árgyros silver) + -ite ¹

Example Sentences

The natural inference was that as the veins were followed deeper the proportion of chalcocite would rapidly diminish, and that a leaner primary zone of chalcopyrite, enargite and other primary minerals would be met.

From The Economic Aspect of Geology by Leith, C. K. (Charles Kenneth)