Specimen Number40-10-020Alternate Number82-31-8CommentsThinly banded magnetite and grunerite + quartz, with accessory biotite.In Teaching CollectionNoMineral(s)magnetitegruneritequartzbiotiteRock NameFe oreDistrictWisconsinMineBlack River FallsExternal LinkMindatDeposit TypeBIFGeo-Coords[1] Donated ByUniversity of Wisconsin-Madison Department of Geoscience
40-10-020: Fe ore - Wisconsin District - Black River Falls Mine. Franklin College Collections, accessed 12/11/2026, https://digitalcollections.franklin.uga.edu/nodes/view/57907