Enargite is a copper arsenic sulfosalt mineral with formula: Cu3AsS4. 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 Mexico, Argentina, Chile, Peru, and the Philippines.mineral, Enargite is commonly found exhibiting a nice and interesting microscope appearance when evaluated under an ore polarizing microscope. Enargite is also commonly used as mineral specimen and often found showing wonderful images under petrographic polarizing light microscopes. Enargite is also considered as a somewhat rare copper mineral.

At least six: native arsenic, realgar, orpiment, arsenopyrite, lollingite, and enargite.

Common and lesser known stones, minerals an just plain old rocks of a black colour are:

Antimony, Augite, Coal -bituminous, Columbite, Enargite, Franklinite, Granite - black, Graphite, Ilvaite, Marble - black, Polybasite, & Slate - black.

Gem stones and crystals include:

Bort or Black Diamond, Coral -black, Chatoyant Quartz (aka Hawk's Eye), Hematite, Jet, Obsidian, Onyx, Pearl - black, Schorl (aka Black Tourmaline) and Smokey Quartz.

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