Chalcopyrite, pyrite, sphalerite and tetrahedrite group mineral. Neves-Corvo, Portugal

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Pyrite (light yellow, high reflectance) forms euhedral crystals (bottom right) and fine-grained aggregates of relict pyrite (poorly polished, centre left) within chalcopyrite (yellow). Tetrahedrite (light blue-grey, centre) is enclosed within sphalerite (light grey, centre) rims.

Polished block, plane polarized light, x 80, air

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