enargite

[en-ahr-jahyt, en-er-jahyt]
noun
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.

Origin:
1850–55; < Greek enarg(ḗs) brilliant (en- en-2 + -argēs, akin to argós bright, árgyros silver) + -ite1

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enargite

sulfosalt mineral, copper arsenic sulfide (Cu3AsS4), that is occasionally an important ore of copper. It occurs as heavy, metallic-gray crystals and masses in veins and replacement deposits. Economically valuable deposits have been found in the Balkans; at several places in Peru; Chuquicamata, Chile; and Butte, Mont. It forms orthorhombic crystals. For detailed physical properties, see sulfosalt (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Our results show indications of isotopic signatures of both abiotic chalcopyrite and enargite dissolution.
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