Sphalerite, chalcopyrite, pyrite and tennantite. Aarja, Oman
Sphalerite (grey), the main phase, encloses irregular chalcopyrite (yellow, top right) and fine chalcopyrite inclusions (centre) but is essentially free of chalcopyrite disease. Small euhedral pyrite crystals (pale yellow-white, centre) lie in a discontinuous veinlet cutting sphalerite. A triangular inclusion of tennantite (green-blue, centre right) is associated with chalcopyrite and two pyrite crystals. Quartz is dark grey, black areas are polishing pits.
Polished block, plane polarized light, x 80, air