![]() ![]() 25 T24N R19W) (WGNHS Files).ĬOLUMBIA COUNTY: Quartz crystals several inches long occur in vugs in a hydrothermal breccia exposed in the Williams Quarry, SE NE sec. Quartz are well-cemented, iron oxide mottled sandstone known as Zebra sandstone occurs at Wildcat Mount, about 4 miles E of Humbird (SE SW Sec. Quartz is also found in gash veins cutting the quartzite, occasionally forming slender euhedral crystals several cm in length (Campbell, 1981).ĬLARK COUNTY: Quartz as Lake Superior agates are found in gravel pits and sand bars along the Black River (Eckert, 1980). – Quartz is the major component of the Flambeau Quartzite exposed in SE Sec. The formation is also mined for frac sand near Grantsburg.ĬALUMET COUNTY: Fossils silicified by quartz can be found in a quarry in dolostone approximately 2 miles N of Sturgeon Bay (Soderman and Carozzi, 1963).ĬHIPPEWA COUNTY: Quartz as Lake Superior agates are found in gravel pits near Chippewa Falls (Eckert, 1980). The most accessible outcrop is at Sandrock Cliffs, a national park service campground in sec. 70 bridge over the river, west of Grantsburg. Croix River both north and south of the Hwy. Simon Formation) exposed at several spots along the St. Cordua field notes, 1992).īURNETT COUNTY: Quartz is the major component of sandstone (likely the Cambrian Mt. 14 T20N R12W Also banded gray to brown agate rinds up to 1 cm thick lining quartz crystal vugs in Prairie du Chien dolostones in a small quarry on County I, 4 miles NE of Nelson, NW Sec. 24 T22N R12W, and quarries east of Cochrane in Sec. Some localities are in a quarry west of Cream NW NW Sec. 21 and 22 T43N R7W in outcrops along the Namakagon River near Cable (Strong, 1880).īUFFALO COUNTY: Quartz is common as drusy clear, white and red crystals in vuggy zones in the Prairie du Chien Group dolostones throughout the county. Quartz as agate occurs in amygdules with laumontite, calcite, pyrite, K feldspar, chlorite and epidote in Keweenawan basalts in Sec. Quartz is abundant as white crystals and small pink to orangish agates in amygdules with chlorite, epidote, K feldspar and bornite in Keweenawan basalts in the south halves of Sec. Some localities are in the marble quarry NW NW NW Sec. 12-15, 21-23 and 27-36 T35N R10W (Hotchkiss, 1915).īAYFIELD COUNTY: Fine cherty to coarse crystalline quartz is common in the Bad River Dolomite throughout the Penokee Range where it is associated with calcite, dolomite, sericite, pyrite and magnetite. 14 T44N R3W) (Van Hise and Irving, 1892).īARRON COUNTY: Quartz is the major component of the Barron quartzite exposed throughout the Blue Hills region such as Sec. Outcrops of these rocks can be found on the N side of the Bad River at Penokee Gap (Sec. Quartz is the major component, with chlorite, biotite and actinolite of the Sunday Quartzite throughout the Penokee Range.Fine cherty to coarse granular quartz is also common in the Bad River Dolomite throughout the Penokee Range where it is associated with calcite, dolomite, tremolite, sericite, pyrite and magnetite. R7E (Greenberg et al., 1986).ĪSHLAND COUNTY: Quartz as “Lake Superior Agate” is widespread in gravel pits throughout the county, as well as along beaches, such as those of the Apostle Islands (Eckert, 1980). ![]() ![]() (Photo by Al Falster.)ĪDAMS COUNTY: Red and green banded quartz and, locally, small crystals, occur in folded quartzite and quartz breccia in outcrops and quarries at Hamilton Mounds in Sec. Quartz with milky quartz overgrowth from the Nine Mile Pluton near Wausau in Marathon County, Wisconsin. Only the most important or unusual occurrences of quartz are mentioned here. There are few places in the state that don’t have quartz in some form. Quartz also forms the bulk of unconsolidated sediments such as drift and alluvium, where it can be found occasionally as Lake Superior agates freed from their volcanic matrix by erosion. ![]() It forms as a groundwater precipitate, and can form sparkling crystals lining cavities in quartzite, limestone and dolostone. It is a common hydrothermal mineral and forms in amygdules in volcanic rock, sometimes in the form of Lake Superior agate. It is an essential component of granitic igneous rocks, of sedimentary rocks such as sandstone and chert and of metamorphic rocks such as quartzites. From Hanley Road roadcut in Hudson, Wisconsin (St. Quartz Quartz crystals in vug showing phantoms. ![]()
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