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Dunn Co., Wisconsin, USA
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The bedrock of the western portion of the county is Ordovician carbonates of the Prairie du Chien group, which is often quarried for crushed stone. Vuggy areas in the Ordovician dolostone can yield interesting samples of calcite, dolomite,quartz and goethite pseudomorphs after marcasite and pyrite. The eastern portion of the county is underlain by Cambrian sandstone and shale. The sandstone is often valued and quarried for "frac sand". The gold noted below is in glacial drift, where small amounts may show up by panning local streams or from cave fill brought in by meltwater streams.

Mineral List

Mineral list contains entries from the region specified including sub-localities
var: Lake Superior Agate

5 entries listed. 4 valid minerals.

Localities in this Region


The above list contains all mineral locality references listed on mindat.org. 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 mindat.org 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, Robert H. & J.W. Attig, (2004) Roadside Geology of Wisconsin, Mountain Press, 345 p.

External Links

Wisconsin Mineral index - Wisconsin Geological and Natural History Survey http://wgnhs.uwex.edu/wisconsin-geology/minerals-wisconsin/

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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