Chlorite is found in the Keweenawan metabasalts in the pits and shaft of the Melrose copper prospect, NW NW sec. Here it is associated with prehnite, copper, epidote,calcite, quartz and laumontite. Chlorite is widespread in the amygdules and groundmass of the Keweenawan metabasalts throughout the county. R.13W. - Chlorite is an abundant amygdule mineral with prehnite, calcite, quartz, chalcopyrite and K feldspar in metabasalt in the quarry in the NW NW sec. Dark green chlorite forms in amygdules, veins and groundmass in Keweenawan basalt at the main shaft of the Weyerhauser Mine, NW SE sec.
Some specific localities are on the south side of sec.
31 and sec. Chlorite is a major component of the country rock as a metamorphic and wall rock alteration mineral at the Crandon ore body. Chlorite is abundant in the iron formation of associated rocks of the Gogebic Iron Range throughout the county. It occurs in the groundmass and in cross-cutting veins with quartz and siderite. Some localities are at the Germania Mine in sec.