Sphalerite, chalcopyrite, galena and pyrite. Parys Mountain, Britain
250µm
Fine-grained and complex intergrowths occur between sphalerite, the main sulphide (light grey), chalcopyrite (yellow, top centre), galena (blue-white, centre bottom) and subhedral pyrite (light yellow-white, bottom centre). Dark grey areas are quartz.
Polished block, plane polarized light, x 80, air
