Specimen Number38-4-015Alternate Number75-1-6CommentsSilicified and chloritized rhyolite/dacite with quartz + pyrrhotite veining. Mine produced until 1907, at which point Atalaya open pit subsumed the earlier workings.In Teaching CollectionNoMineral(s)quartzsericitechloritepyrrhotiteRock Namealtered daciteDistrictRio TintoMineSan DionisioExternal LinkMindatDeposit TypeVMSGeo-Coords[1] Donated ByUniversity of Wisconsin-Madison Department of Geoscience
38-4-015: altered dacite - Rio Tinto District - San Dionisio Mine. Franklin College Collections, accessed 12/11/2026, https://digitalcollections.franklin.uga.edu/nodes/view/57009