Sphalerite, chalcopyrite, pyrite and tennantite. Aarja, Oman

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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

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