Pyrrhotite, pentlandite and chalcopyrite. Bushveld, Republic of South Africa
Pyrrhotite (brown, centre) has coarse-grained pentlandite crystals (light brown, high reflectance) about its margin (left centre) and fine-grained pentlandite as a flame-like exsolution body (centre right) below chalcopyrite (yellow, centre right). Smaller pentlandite flames are seen along the top and bottom margins of the pyrrhotite. Silicates are dark grey.
Polished block, plane polarized light, x 80, air