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Dodge Co., Wisconsin, USA

Dodge County is underlain primarily by Paleozoic sedimentary rocks - primarily sandstone and dolostone. Ordovician rocks dominate, although part of the Niagara escarpment, marking the contact with harder Silurian dolostones, dominates the northeastern edge of the County. There are a few outcrops of Precambrian quartzite cut by pegmatites in the southern portion, which are quarried,and have yielded interesting minerals. A discontinuous zone at the top of the Ordovician Maquoketa Shale is called the Neda Ironstone, an oolitic hematite-rich zone with a wealth of rare (though very fine-grained) minerals identified by XRD. These deposits were mined in the IronRridge District, but mines are now abandoned and serve as a major bat hibernarium.

Mineral List

Mineral list contains entries from the region specified including sub-localities
Allophane
Andalusite
Anorthoclase
'Apatite'
'var: Collophane'
Beyerite
'Biotite'
Bismuth
Calcite
'Chlorite Group'
Chloritoid
Columbite-(Mn)
Corundum
Cristobalite
Delvauxite
Dolomite
'Evansite'
'Feldspar Group'
Fluorite
Gahnite
Goethite
Gypsum
'Halloysite'
Hematite
Ilmenite
Kaolinite
Kettnerite
Lepidolite
Magnetite
Marcasite
Metavariscite
Microcline
Microlite Group
var: Bismutomicrolite (of Hogarth 1977)
var: Uranmicrolite (of Hogarth 1977)
Muscovite
var: Lithian Muscovite
Northupite
Opal
Orthoclase
Phosphosiderite
Pyrite
Pyrrhotite
Quartz
Siderite
Spessartine
'Stevensite' ?
Tantalite-(Mn)
Thorite
Tridymite
Variscite
Waylandite
Zircon


62 entries listed. 42 valid minerals.

Localities in this Region

USA
USA

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.

External Links

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