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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... Wikipedia
Streak: Black
Cleavage: Perfect on, distinct, and
Color: Grayish black to iron black; gray to pale pink-brown, deep red internal reflections in polished section
Crystal class: Pyramidal (mm2); H-M symbol: (mm2)
Crystal habit: Tabular to prismatic crystals, striated parallel to; massive
Crystal system: Orthorhombic
Fracture: Uneven