Pyrite, sphalerite and galena. Cofer deposit, Virginia, USA
Euhedral to subhedral pyrite (yellow-white) contains small inclusions of galena (bottom left). Galena (blue-white) also occurs at the triple junction between three pyrite crystals (centre). Subhedral to anhedral sphalerite (light grey, top right) is present within a silicate (dark grey) gangue. Black areas are polishing pits.
Polished block, plane polarized light, x 80, air