Typically found as dark-grey to black massive material; crystals usually thick tabular, but may also be prismatic.
May contain minor Sb (Springer, 1969). The most Sb-rich enargite was found to have the composition Cu3As0.8Sb0.2S4 (Pósfai & Buseck, 1998). Note: The synthetic systemCu3AsxSb1-xS4 has a two phase region at x = 0.8. Mixtures with x < 0.8 crystallize in the famatinite type, compositions with x > 0.8 crystallize in theenargite type (Pfitzner & Bernert, 2004).
Chemically similar totennantite which, however, has no cleavage.