Specimen Number40-7-028Alternate Number82-28-1CommentsSulfidic shale/BIF. Large ovoid concretionary masses of pyrite (or marcasite?) in shale. Some masses to 4 cm.In Teaching CollectionNoMineral(s)clayquartzpyriteRock Namesulfidic shaleDistrictAlgomaMineregional sampleExternal LinkMindatDeposit TypeBIFDonated ByUniversity of Wisconsin-Madison Department of Geoscience