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Waukesha Co., Wisconsin, USA

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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

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

2 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.


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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