Greigite, Pyrite
Dybryn U deposit, Vitim Plateau, Baunt District, Buryatia, Russia
SEM image of polished section. More bright in BSE spheroids of Greigite within some less darker groundmass of Pyrite. Both minerals contains only Fe and S, contents of As, Ni, Co, Tl, Se are below detection levels of microprobe. Fe/S ratio in Greigite is 3/4, while in Pyrite it is 1/2. So Greigite is more heavy matrix, and better reflects ...
© Pavel M. Kartashov collection & photo