Galena, Dolomite & Marcasite
Locality: Sweetwater Mine, Ellington, Reynolds Co., Missouri, USA
Marcasite, Trepca Stan Terg mine
Locality: Trepca
Calcite, Marcasite
Locality: Linwood Mine, Buffalo, Scott Co., Iowa, USA
Iridescent Marcasite on Calcite
Locality: Santa Barbara
Goethite psd. Marcasite
Locality: White Desert, Farafra Oasis, New Valley Governorate, Egypt
Marcasite in Calcite with Pyrite
Locality: Brushy Creek Mine, Reynolds Co., Missouri