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Marinette Co., Wisconsin, USA

Marinette County contains very diverse bedrock. The southeastern portion consists of Cambrian and Ordovician sedimentary rocks dipping monoclinally gently to the east, off the Wisconsin Arch. The Cambrian rocks are mostly clastic sandstones, while the Ordovician rocks are carbonate dominated. The northwestern portion of the county contains diverse Proterozoic metamorphic and igneous rocks. These are dominated by granites, meta-volcanic and meta-sedimentary rocks deformed during the 1.80 – 1.85 billion year old Penokean Orogeny. The Penokean orogeny was a continent-continent collision, with the rocks seen in the county being ocean crust and island arc materials caught up in the collision. Quartzite outcrops at McCaslin and Thunder Mountains, and can yield nice quartz crystals. Several small molydbenite deposits are known from the county. Locally ultramafic rocks host magnesite and chromite deposits. To date, none of the deposits have proved of major economic value. Thick glacial drift, lakes and forests make outcrops scarce, but these deposits can yield interesting glacially transported rocks and minerals.

Mineral List

Mineral list contains entries from the region specified including sub-localities
Actinolite
Albite
var: Oligoclase
'Albite-Anorthite Series'
'Allanite'
Andalusite
Anthophyllite
'Apatite'
'Biotite'
Calcite
Chalcopyrite
'Chlorite Group'
Chloritoid
Chromite
Clinozoisite
Cummingtonite
Epidote
Ferrimolybdite
Ferro-Actinolite
Fluorite
Galena
'Garnet'
Graphite
Grunerite
'Hornblende'
Ilmenite
'K Feldspar'
Magnesite
Magnetite
Molybdenite
'Monazite'
Muscovite
var: Sericite
Phlogopite
'Prochlorite'
Pyrite
Pyrrhotite
Quartz
'Serpentine Group'
Sillimanite
Sphalerite
Stilpnomelane
Talc
Titanite
Tremolite
Zircon


49 entries listed. 33 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.

References

Olson, J. (1984) The Geology of the Lower Proterozoic Mc Caslin Formation, northeastern Wisconsin: Geoscience Wisconsin 9: 1-19.

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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.
Current server date and time: October 25, 2014 22:50:38 Page generated: December 9, 2013 00:49:55
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