Geology in Action! While examining this dark shale core, we observed shiny stringers of pyrite (“fool’s gold”) beautifully aligned along the bedding planes. These fine sulphide streaks tell a deeper story; they often form when metal-rich hydrothermal fluids move through organic-rich shales under reducing conditions, precipitating pyrite along natural layering. Such features are key indicators of sulphide mineralization systems, often associated with lead-zinc or even gold deposits in sedimentary