T.44N. R.3W.and in SE NW sec. Tremolite occurs locally in the metamorphosed Ironwood Iron Formation with grunerite, actinolite and various pyroxenes. Some localities of tremolite-bearing iron formation are in a roadcut on the west side of highway 13 about 5 km. Pale green tremolite crystals in indivduals and radiating groups up to several cm. Some layers in the marble are almost pure tremolite.
Tremolite forms rims separating quartz grains and pods form the carbonate.
Pyrite, chlorite, magnetite and sericite are associated minerals. Tremolite is found in outcrops of the Bad River dolomitic marble near the Marengo river in the SW sec. The tremolite forms radiating clusters and coarse crystals in veins. Tremolite occurs with scapolite, diopside and grossular in calcite in veins cutting the intensely altered volcanic rocks at the Pelican River massive sulfide deposit in sec. Here it forms asbestiform fibers up to 5 cm.