Specimen Number28-9-021Alternate NumberA-26Commentsfrom Bob Carpenter research collectionIn Teaching CollectionNoMineral(s)covellitepyriteField Notespolished plugRock Namepolished plugsDistrictButteDeposit TypePorphyry CopperReference MaterialACL-125: Miller, R.N., ed., 1973, Guidebook for the Butte Field Meeting of Society of Economic Geologists, Butte, Montana, August 18-21, 1973.
28-9-021: polished plugs - Butte District - Undefined Mine. Franklin College Collections, accessed 09/06/2026, https://digitalcollections.franklin.uga.edu/nodes/view/36027