Pyrrhotite, sphalerite, chalcopyrite and galena. Unknown Provenance

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Pyrrhotite crystals (brown) show bireflectance and reflection pleochroism (light brown to darker brown, centre). They are equidimensional and have triple junctions which suggest they have recrystallized. Inclusion-free sphalerite (light grey, bottom) is intergrown and encloses a grain of galena (white, bottom right) and chalcopyrite (top centre).

Polished block, plane polarized light, x 80, air

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