Specimen Number36-4-010Alternate Number18717CommentsBiotite lamprophyre dike, biotite phenocrysts to 0.5 cm in very fine-grained matrix.In Teaching CollectionNoMineral(s)biotitepyroxeneplagioclaseRock NamelamprophyreDistrictCripple CreekMinePortlandExternal LinkMindatGeo-Location17th level.Deposit TypeDiatremeGeo-Coords[1] Donated ByUniversity of Wisconsin-Madison Department of Geoscience
36-4-010: lamprophyre - Cripple Creek District - Portland Mine. Franklin College Collections, accessed 13/11/2026, https://digitalcollections.franklin.uga.edu/nodes/view/54991