Specimen Number36-4-012Alternate Number18718CommentsPhonolite breccia with large granitic clast, very fine-grained disseminated pyrite throughout.In Teaching CollectionNoMineral(s)feldsparnephelinequartzpyriteRock Namemineralized phonoliteDistrictCripple CreekMinePortlandExternal LinkMindatGeo-Location17th level.Deposit TypeDiatremeGeo-Coords[1] Donated ByUniversity of Wisconsin-Madison Department of Geoscience
36-4-012: mineralized phonolite - Cripple Creek District - Portland Mine. Franklin College Collections, accessed 12/11/2026, https://digitalcollections.franklin.uga.edu/nodes/view/54992