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Eau Claire Co., Wisconsin, USA

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Eau Claire County is underlain mostly by Cambrian sandstones. Good outcrops occur on many bluffs (such as Mt. Simon in Eau Claire) and along rivers, such as the Chippewa. Complex Precambrian rocks, including gneiss, amphibolites and granites are exposed along the Eau Claire River and its tributaries, as is well shown at Big Falls County Park. Glacial drift in the County occurs along large meltwater channels. The drift can provide some interesting samples to the diligent collector, including "float" copper, banded iron formation and "Lake Superior" agates.

Mineral List

Mineral list contains entries from the region specified including sub-localities

13 entries listed. 9 valid minerals.

Localities in this Region

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Dott, R. H. & J. W. Attig (2004) Roadside Geology of Wisconsin: Mountain Press, 346 p.

External Links

Wisconsin Mineral index - Wisconsin Geological and Natural History Survey

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