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Enargite



Enargite

2cm specimen of Enargite crystals on pyrite from Butte, Montana
General
CategoryMinreral: Sulfide
Chemical formulaCu3AsS4
Identification
Molecular Weight393.82 gm
ColorGreyish Black to Black
Crystal habitmassive to well crystaline
Crystal systemOrthorhombic
CleavagePerfect [110], Distinct [100] & [010]
Fractureuneven
TenacityBrittle
Mohs Scale hardness3
LusterMetallic
Ultraviolet fluorescenceNone
StreakBlack
Specific gravity4.4 to 4.5
DiaphaneityOpaque
References[1][2][3]

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. It is a medium to low temperature hydrothermal mineral occurring with quartz, pyrite, as well as other copper sulfides. It occurs in the mineral deposits at Butte, Montana, San Juan Mountains, Colorado and at both Bingham Canyon and Tintic, Utah. It is also found in the copper mines of Canada, Mexico, Argentina, Chile, Peru, and the Philippines.

Additional recommended knowledge

Enargite was originally described as a new species from the copper mines of the San Francisco vein, Junin Department, Peru

References

  1. ^ http://www.mindat.org/min-1380.html Mindat
  2. ^ http://webmineral.com/data/Enargite.shtml Webmineral
  3. ^ http://mineral.galleries.com/minerals/sulfides/enargite/enargite.htm Mineral galleries
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Enargite". A list of authors is available in Wikipedia.
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