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Wisconsin, USA
This page kindly sponsored by Bill Cordua

 
 
Wisconsin has a diversity of mineral occurrences. Glaciers covered most of the state during the Pleistocene. The glacial drift contains a variety of jumbled materials, including drift copper, diamonds, flour gold, and, most notably, Lake Superior agates. Despite the glacial cover, many bedrock outcrops occur in the state. The bedrock structure is essentially a gentle arch cored by Precambrian rocks. Proterozoic carbonate rocks form the edge of the arch. Vugs in these rocks yield interesting crystallized minerals, such as millerite, fluorite, calcite and marcasite. In the southwestern portion of the state (Iowa, Lafayette and Grant counties) these rocks host classic Mississippi Valley-type lead-zinc deposits. The state mineral, galena, and state mascot, the badger, refer to the main ore and the nineteenth century miners. Toward the center of the state is a broad swath underlain by Cambrian sandstones, worked currently for “frac sand”. The bedrock in the northwestern part of the state is dominated by a continuation of the 1,100 million year old Midcontinent Rift from Michigan’s famous Keweenaw Peninsula. Although lacking in the bonanza copper deposits of Michigan, these rocks do contain similar minerals, most notably in Douglas County. The central part of the state contains granites and metamorphic rocks. Wisconsin’s state rock, red granite, comes from pits in this region. Some granitic rocks, notably in Marathon County, host interesting complex pegmatites. Across central Wisconsin is a 1,800 million year old volcanic belt that contains large massive sulfide deposits. Of these, the Flambeau Mine in Rusk County, produced many excellent mineral specimens. In the northeastern part of the state, Proterozoic banded iron formation of the Gogebic Range produced excellent specimens, particularly from the Montreal Mine in Iron County.

Mineral List

Mineral list contains entries from the region specified including sub-localities
Acanthite
Actinolite
Aegirine
Agrellite
Albite
var: Andesine
var: Cleavelandite
var: Oligoclase
'Albite-Anorthite Series'
'Alkali Feldspar'
'Allanite'
Allanite-(Ce)
Allophane
Alluaudite
Almandine
Altaite
Alunite
Amblygonite
Amphibole Supergroup
Analcime
Anatase
Andalusite
var: Chiastolite
Andradite
Anglesite
Anhydrite
Ankerite
Annite
Anorthite
var: Bytownite
'Anorthoclase'
Anthophyllite
Antigorite
'Apatite'
'var: Carbonate-rich Apatite'
'var: Collophane'
'Apophyllite'
Aragonite
Arfvedsonite
Arsenopyrite
Augite
Aurichalcite
Azurite
Baddeleyite
Baryte
'Bastnäsite'
Bastnäsite-(Ce)
'Bastnäsite Group'
Bastnäsite-(La)
Bavenite
Beaverite-(Cu)
Behierite
Bermanite
Bertrandite
Beryl
var: Aquamarine
var: Morganite
Beyerite
'Biotite'
Birnessite
Bismuth
Bornite
Boulangerite
Braunite
Brookite
Brucite
Cacoxenite
Calaverite
Calcite
var: Limestone Onyx
var: Manganoan Calcite
Cancrinite
Cassiterite
Catapleiite
'Catlinite'
Celadonite
Celestine
Cerussite
Chalcanthite
Chalcocite
Chalcopyrite
Chamosite
var: Thuringite
Cheralite
'Cheralite-(Ce)'
'Chert'
Chevkinite-(Ce)
'Chlorite Group'
Chloritoid
Chromite
Chrysocolla
Chrysotile
Clinochlore
'Clinopyroxene Subgroup'
Clinozoisite
Cobaltite
'Columbite'
Columbite-(Fe)
Columbite-(Mn)
'Columbite-Tantalite'
Cookeite
Copiapite
Copper
Cordierite
Corrensite
Corundum
Covellite
Crandallite
Cristobalite
Cryolite
Cryptomelane
Cubanite
Cummingtonite
Cuprite
var: Chalcotrichite
Datolite
Daubréelite
Delvauxite
Diamond
Diaspore
Dickite
Digenite
Diopside
var: Chromian Diopside
Djurleite
Dolomite
Dyscrasite
Dzhalindite
Elbaite
Enargite
Enstatite
Epidote
Epsomite
Erythrite
Euclase
Eudialyte
Eudialyte Group
var: Eucolite

Euxenite-(Y)
'Evansite'
Fayalite
'Feldspar Group'
Ferberite
'Fergusonite'
Ferrimolybdite
Ferristrunzite
Ferro-actinolite
Ferro-gedrite
Ferro-hornblende
Fillowite
'Flint'
Florencite-(Ce)
Fluorapatite
var: Carbonate-rich Fluorapatite
var: Mn-bearing Fluorapatite
Fluorite
Foitite
Forsterite
Freibergite
'Gadolinite'
Gadolinite-(Y)
Gahnite
Galena
var: Argentiferous Galena
'Garnet'
Gedrite
Glaucodot
Glauconite
Goethite
Gold
var: Electrum
Gorceixite
Goslarite
Graphite
Grayite
Greenalite
Greenockite
Griphite
Grossular
Grunerite
Gypsum
var: Selenite
'Halloysite'
Halotrichite
Hambergite
Hastingsite
Hedenbergite
Helvine
Hematite
var: Kidney Ore
var: Martite
var: Specularite
Hemimorphite
Hessite
'Heulandite'
Hidalgoite
Hisingerite
Hollandite
Honessite (TL)
'Hornblende'
Hübnerite
Hureaulite
Huttonite
Hydromagnesite
Hydrozincite
'Hypersthene'
'Iddingsite'
Ilmenite
var: Picroilmenite
Iron
var: Kamacite

Ixiolite
Jamesonite
Jarosite
Kaolinite
Kemmlitzite
Kentbrooksite
Kettnerite
'K Feldspar'
'var: Adularia'
Kolbeckite
Krennerite
Kutnohorite
Kyanite
Laumontite
Låvenite
Lawrencite
Lazulite
Leadhillite
'Lechatelierite
var: Fulgurite'

Lepidocrocite
Lepidolite
Leucophosphite
'Leucoxene'
Liandratite
'Limonite'
Lithiophilite
Löllingite
Magnesiofoitite
Magnesite
Magnetite
var: Titaniferous Magnetite
Malachite
'Manganese Oxides
var: Manganese Dendrites'

Manganite
Marcasite
Melanterite
Metavariscite
Metavivianite
'Mica Group'
Microcline
var: Amazonite
Microlite Group
var: Bismutomicrolite (of Hogarth 1977)
var: Uranmicrolite (of Hogarth 1977)
Millerite
Minium
Minnesotaite
Miserite
Molybdenite
'Monazite'
Monazite-(Ce)
Monazite-(La)
Monazite-(Nd)
Montmorillonite
'Moonstone'
Muscovite
var: Fuchsite
var: Illite
var: Lithian Muscovite
var: Sericite
Natrolite
Natrophilite
'Needle-ore'
Neotocite
Nepheline
Nickeline
Northupite
'Ochre'
'Olivine'
Opal
var: Opal-AN
Orthoclase
'Orthopyroxene Subgroup'
Osarizawaite
'Parisite'
Pectolite
Pentlandite
'Percivalite'
Perrierite-(Ce)
'Perthite'
Petzite
Phenakite
Phlogopite
Phosphosiderite
Pigeonite
Platinum
'Plessite'
Plumbogummite
Pollucite
Polybasite
Polycrase-(Y)
Prehnite
'Prochlorite'
Prosopite
Pseudobrookite
Pseudomalachite
Pseudorutile
'Psilomelane'
'Pumpellyite'
Purpurite
Pyrargyrite
Pyrite
'Pyrochlore'
Pyrochlore Group
var: Bariopyrochlore (of Hogarth 1977)
var: Ceriopyrochlore (of Hogarth 1977) (TL)
var: Plumbopyrochlore (of Skorobogatova et al.)
Pyrolusite
Pyromorphite
Pyrope
Pyrophyllite
'Pyroxene Group'
Pyrrhotite
Quartz
var: Agate
var: Aventurine
var: Chalcedony
var: Jasper
var: Lake Superior Agate
var: Rose Quartz
var: Smoky Quartz
'Rhabdophane'
Rhabdophane-(Ce)
Rhabdophane-(La)
Rhabdophane-(Nd)
Rhodizite
Rhodochrosite
Riebeckite
Riebeckite Root Name
var: Crocidolite

Romanèchite
Rosasite
Rutile
var: Ilmenorutile
var: Strüverite
Rynersonite
Safflorite
Samarskite-(Y)
Sanidine
Saponite
Sauconite
'Scapolite'
'Schalenblende'
Scheelite
Schorl
Schreibersite
'Serpentine Group'
Sicklerite
Siderite
Siderophyllite
Siegenite
Sillimanite
Silver
Smithsonite
Sodalite
Spessartine
Sphalerite
Spinel
Spodumene
Staurolite
Stephanite
'Stibiconite'
Stibiotantalite
Stilpnomelane
Strontianite
Sulphur
Svanbergite
'Synchysite'
'Synchysite Group'
Taenite
Talc
Tantalite-(Fe)
Tantalite-(Mn)
Tantite
'Tapiolite'
Tapiolite-(Fe)
Tennantite
Tenorite
Tetrahedrite
Thalénite-(Y)
Thomsonite-Ca
Thorite
'Thorogummite'
Titanite
Topaz
'Tourmaline'
'var: Rubellite'
Tremolite
Tridymite
Triphylite
Troilite
Uraninite
Uranophane
'Uranpyrochlore (of Hogarth 1977)'
'Uvite'
Vanadinite
Variscite
Varulite
Väyrynenite
Vesuvianite
Violarite
Vivianite
'Wad'
Wavellite
Waylandite
Wodginite
Wöhlerite
Wollastonite
Wurtzite
Xenotime-(Y)
'Zaratite'
'Zinnwaldite'
Zircon
Zoisite


435 entries listed. 310 valid minerals. 1 type locality (valid mineral). 1 type locality (other).

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

Dutton, C. E. & R. Bradley (1970) Lithologic, Geophysical and Mineral Commodity Maps of Precambrian Rocks in Wisconsin, U. S. Geological Survey, Miscellaneous Geologic Investigation Map I-631, 15 p. and 6 sheets.

Paull, R. K. & R. A. Paull (1977) Geology of Wisconsin and upper Michigan: Kendall/Hunt Publishers, 232 p.

Paull, R. K. & R. A. Paull (1980) Field Guide - Geology of Wisconsin and upper Michigan: K/H Geology field guide Series: Kendall/Hunt Publishers, 260 p.

LaBerge, Gene L. (1994) Geology of the Lake Superior Region , Penokee Press, 313 p

Cordua, William (1998) "Wisconsin Mineral Locality Index": Rocks & Minerals: 73: 378-399.

Dott, Robert H. & J.W. Attig, (2004) Roadside Geology of Wisconsin, Mountain Press, 345 p.


External Links

On-line Wisconsin mineral index http://wisconsingeologicalsurvey.org/MinIndexIntro.htm [Link Broken? Oct 2014]

Wisconsin Geological and Natural History Survey: http://wisconsingeologicalsurvey.org/

Wisconsin Geological Society: http://www.wisgeologicalsociety.com/

Weis Earth Science Museum https://www.uwfox.uwc.edu/wesm/ [Link Broken? Oct 2014]

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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 24, 2014 18:10:35 Page generated: October 20, 2014 00:38:32
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