Specimen Number22-5-011Alternate NumberRoc-2CommentsBrecciated basalt in matrix of quartz + calcite + epidote + datolite.In Teaching CollectionNoMineral(s)calcitedatoliteepidotequartzRock Namealtered basaltDistrictKeweenawMineRocklandExternal 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.
22-5-011: altered basalt - Michigan District - Rockland Mine. Franklin College Collections, accessed 08/06/2026, https://digitalcollections.franklin.uga.edu/nodes/view/37999