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enargite

[en-ahr-jahyt, en-er-jahyt]
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noun
  1. a mineral, copper arsenic and sulfide, Cu3AsS4, occurring in the form of black orthorhombic crystals having perfect cleavage: an important source of copper.

Origin of enargite

1850–55; < Greek enarg(ḗs) brilliant (en- en-2 + -argēs, akin to argós bright, árgyros silver) + -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018