Chalcopyrite, pyrrhotite, magnetite, sphalerite and pyrite. Sweden
Chalcopyrite (yellow) is intergrown with pyrrhotite (light brown, left) and minor sphalerite (grey, bottom left). Within the silicate-rich central areas, euhedral magnetite (light grey, higher reflectance than sphalerite, centre) carries pyrrhotite inclusions. A single euhedral crystal of pyrite (white, centre left) is present.
Polished block, plane polarized light, x 80, air