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Forest Co., Wisconsin, USA

Complex Precambrian rocks underlie Forest County, which are obscured by thick glacial drift, lakes, forests and marshes. Scattered outcrops and drill core reveal older gneissic terrane overlain by Lower Proterozoic meta-sedimentary and meta-volcanic rocks representing a sequence caught up between colliding continents and deformed during the 1.8 billion year old Penokean Orogeny. Several massive sulfide deposits are known in the county, including the world-class Crandon deposit. Their discovery is based almost solely on geophysical and drill core records - outcrops are sparse. In the southeastern corner of the County, cleaner quartzite of McCaslin Mountain are exposed in monadnocks. The extensive glacial drift in the County can provide some interesting samples to the diligent collector, including "float" copper, banded iron formation and "Lake Superior" agates.

Mineral List

Mineral list contains entries from the region specified including sub-localities
'Albite-Anorthite Series'
Almandine
Andradite
Arsenopyrite
Augite
Bornite
Brucite
Calcite
Chalcocite
Chalcopyrite
'Chert'
'Chlorite Group'
Clinozoisite
Copper
Covellite
Digenite
Dolomite
Enargite
Epidote
Fluorite
Galena
Goethite
Gold
var: Electrum
Graphite
Hematite
'Iddingsite'
Magnetite
Marcasite
Muscovite
Muscovite
var: Sericite

'Olivine'
Pyrite
Pyrrhotite
Quartz
'Serpentine Group'
Silver
Sphalerite
Stephanite
Talc


40 entries listed. 32 valid minerals.

Localities in this Region

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

LaBerge, G. L. (1994) Geology of the Lake Superior Region: Geoscience Press, 313 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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