Ore deposit type: Hydrothermal associated with magmatism, volcanogenic massive sulphides (VMS)
Provenance: Alagna Valsesia (Piedmont, NW Italy)
Description: : Laminated ore with dominant pyrite (anhedral to euhedral, yellow, metallic) and minor chalcopyrite (not visible) in albite chlorite schist. The mineralization originally formed syngenetically on a seafloor rich in volcanoclastic sediments and was subsequently metamorphosed during the Alpine orogeny. The metamorphism caused the recrystallisation and coarsening of pyrite.
Thin section under transmitted light
Thin section under reflected light