In enargite, the crystals do not have any unique terminations, just a flat face. In the mineral hemimorphite, the top termination faces slant to a point and the bottom termination is much more blunted, a clear difference. Unfortunately for enargite its hemimorphic character is undetectable because of its crystal form. Color is gray to black. Luster is metallic.
Crystals are opaque.
Also found massive, granular and in radiating aggregates. Twinning is common and sometimes results in a star shaped cyclic twin called a trilling . Fracture is uneven. Streak is black. Associated Minerals are quartz , bornite , galena , sphalerite , tennantite , chalcocite , chalcopyrite , covellite , pyrite and other sulfides .