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Rusk Co., Wisconsin, USA

Rusk County's bedrock is a generally poorly exposed complex sequence of Proterozoic 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, including massive sulfide deposits, caught up in the collision. The Flambeau Mine is the most notable example, which also had substantial oxidized and supergene zones shielded from glacial erosion by a thin cap of Cambrian sandstone. It was mined in the 1990's and produced an array of excellent specimens, most famously twinned chalcocite crystals with an iridescent patina.

A younger relatively undeformed Proterozoic quartzite holds up the Blue Hills in the western part of the county. These are spectacularly exposed in Gundy's Canyon.

Thick glacial drift, lakes and forests make outcrops scarce, but these deposits can yield interesting glacial transported rocks and minerals, such as float copper and "Lake Superior" agates.

Mineral List

Mineral list contains entries from the region specified including sub-localities
Actinolite
'Albite-Anorthite Series'
Almandine
Andalusite
Anhydrite
Ankerite
Anthophyllite
Antigorite
'Apatite
var: Carbonate-rich Apatite'

Aragonite
Arsenopyrite
Augite
Aurichalcite
Azurite
Beaverite-(Cu)
'Biotite'
Bornite
Calcite
Chalcanthite
Chalcocite
Chalcopyrite
'Chlorite Group'
Chrysocolla
Copper
Cordierite
Covellite
Crandallite
Cubanite
Cuprite
var: Chalcotrichite
Digenite
Dolomite
Dzhalindite
Epidote
Ferristrunzite
Forsterite
Gahnite
Galena
'Garnet'
Glaucodot
Goethite
Gold
Gypsum
Halotrichite
Hematite
Hessite
Hidalgoite
'Hornblende'
Ilmenite
Jarosite
Kaolinite
Kemmlitzite
Kolbeckite
Leucophosphite
Magnetite
Malachite
Marcasite
Metavivianite
Muscovite
var: Sericite

'Olivine'
Orthoclase
Osarizawaite
Petzite
Plumbogummite
Pseudomalachite
Pyrite
Pyrophyllite
Pyrrhotite
Quartz
Rosasite
Rutile
Siderite
Silver
Spessartine
Sphalerite
Tennantite
Tenorite
Titanite
Tremolite
Vivianite
Zircon


81 entries listed. 72 valid minerals.

Localities in this Region

USA

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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: April 25, 2014 04:27:05 Page generated: January 25, 2014 03:16:25
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