Pyrite, sphalerite and chalcopyrite. Cofer deposit, Virginia, USA

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Pyrite (yellow-white, right) is fractured along its cleavage and rimmed by chalcopyrite (yellow) and inclusion-free sphalerite (light grey, bottom left). Pyrite encloses lath-shaped phyllosilicates (dark grey, centre). Silicates are dark grey. Black areas are polishing pits.

Polished block, plane polarized light, x 40, air

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