Specimen Number22-5-004Alternate NumberMass-1CommentsHost uncertain but sure looks like a basalt. Abundant quartz + epidote + chlorite + microcline(?).In Teaching CollectionNoMineral(s)chloriteepidotemicroclinequartzRock Namealtered basaltDistrictKeweenawMineMassExternal LinkMindatDeposit TypeKeweenaw CopperGeo-Coords[1] Reference MaterialACL-143: White, W.S., 1966, Tectonics of the Keeweenaw Basin, Western Lake Superior Region; U.S. Geol. Surv. Prof. Paper 524-E, Washington, D.C., 22 p.
22-5-004: altered basalt - Michigan District - Mass Mine. Franklin College Collections, accessed 14/06/2026, https://digitalcollections.franklin.uga.edu/nodes/view/37992