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Waukesha Co., Wisconsin, USA

Waukesha County is underlain by Ordovician to Silurian sedimentary rocks, largely carbonates, that dip gently east off the Wisconsin Arch. The carbonates are widely quarried, and produce a particularly attractive building material called "Lannon Stone", a fine-grain slabby dolostone of Silurian age. The area is covered by drift from the Green Bay and Lake Michigan lobes. Excellent continental glacial landforms are particularly well-developed in the western part of the county, as seen along the Ice Age National Scenic Trail and in the Kettle Moraine State Forest. The drift can yield some interesting minerals. As a case in point,the Eagle diamond, a 16.25 carat yellow diamond, was found by a well digger in 1876. The known human history of this stone ends with its theft from the American Museum of Natural History by "Murph the Surf" in 1964.

Mineral List

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3 entries listed. 2 valid minerals.

Localities in this Region


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Cannon, W. & M. Mudrey (1981) The potential for diamond-bearing kimberlite in northern Michigan and Wisconsin: U. S. Geological Survey: Circular 842, 15 p.

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

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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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