3 T.20N. R.12W. and NW NW sec. I about 4 miles NE of Nelson in the NW sec. Calcite is found in veins and amygdules in the Keweenawan volcanic rocks throughout the county. 14 and SE sec. Calcite exists in the country rock as well as in veins at the Crandon massive sulfide deposit 10 km.
Calcite is widespread in the mines and prospects of the Upper Mississippi Valley zinc-lead district.
Type 1 is cloudy, deeply etched crystals colored white, brown, orange-pink or grey. Type 3 calcite forms clear colorless scalenohedra modified by rhombohedrons. Type 4 forms clear highly modified rhombohedrons. The various types form phantoms, sceptors or other overgrowths. Parallel growths of complex rhombohedrons are also found.