Specimen Number35-8-029Alternate Number10629CommentsPotassically altered granite with disseminated pyrite.In Teaching CollectionNoMineral(s)k-sparquartzbiotitepyriteRock Namealtered graniteDistrictButteDeposit TypePorphyry CopperDonated ByUniversity of Wisconsin-Madison Department of GeoscienceReference MaterialACL-125: Miller, R.N., ed., 1973, Guidebook for the Butte Field Meeting of Society of Economic Geologists, Butte, Montana, August 18-21, 1973.
35-8-029: altered granite - Butte District - Unknown Mine. Franklin College Collections, accessed 14/11/2025, https://digitalcollections.franklin.uga.edu/nodes/view/54731