1) Copper mineral 2) Orthorhombic mineral
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https://www.crosswordclues.com/clue/enargite
Enargite is a copper arsenic sulfosalt mineral with formula: Cu3AsS4. It takes its name from the Greek word enarge, `distinct.` Enargite is a steel gray, blackish gray, to violet black mineral with metallic luster. It forms slender orthorhombic prisms as well as massive aggregates. It has a hardness of 3 and a specific gravity of 4.45. Enargite .....
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http://en.wikipedia.org/wiki/Enargite
• (n.) An iron-black mineral of metallic luster, occurring in small orthorhombic crystals, also massive. It contains sulphur, arsenic, copper, and often silver.
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http://thinkexist.com/dictionary/meaning/enargite/
sulfosalt mineral, copper arsenic sulfide (Cu3AsS4), that is occasionally an important ore of copper. It occurs as heavy, metallic-gray crystals and ...
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http://www.britannica.com/eb/a-z/e/28
En·ar'gite noun (Min.) An iron-black mineral of metallic luster, occurring in small orthorhombic crystals, also massive. It contains sulphur, arsenic, copper, and often silver.
Found on
http://www.encyclo.co.uk/webster/E/33
Enargite is a relatively rare mineral found in vein and replacement deposits associated with pyrite, sphalerite, bornite, galena, chalcocite. It is used as an ore of copper. It has the formulae Cu3AsS4 and a relative hardness of 4.
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http://www.probertencyclopaedia.com/browse/HE.HTM
(Copper Arsenic Sulfide) Enargite is a somewhat rare copper mineral. It does not often form well shaped crystals, but there are several localities that produce some fine enargite clusters. Its crystals that form tabular to blocky to prismatic forms are often pseudohexagonal, having six sides but not six identical sides. Twinnin...
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https://www.encyclo.co.uk/local/23719
a mineral, copper arsenic and sulfide, CuAsS, occurring in the form of black orthorhombic crystals having perfect cleavage: an important source of copper.
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https://www.infoplease.com/dictionary/enargite
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