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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-(Ce)

'Allanite Group'

Allophane

Alluaudite

Almandine

Altaite

Alunite

Amblygonite

'Amphibole Supergroup'

Analcime

Anatase

Andalusite

var: Chiastolite

Andradite

Anglesite

Anhydrite

Ankerite

Annabergite

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)'

Béhierite

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

var: Travertine

Cancrinite

Cassiterite

Catapleiite

'Catlinite'

Celadonite

Celestine

Cerussite

Chalcanthite

Chalcocite

Chalcopyrite

Chamosite

var: Thuringite

Cheralite

'Cheralite-(Ce)'

Chevkinite-(Ce)

'Chlorite Group'

Chloritoid

Chromite

Chrysocolla

Chrysotile

'Clays'

Clinochlore

'Clinopyroxene Subgroup'

Clinozoisite

Cobaltite

'Columbite'

Columbite-(Fe)

'Columbite-(Fe)-Columbite-(Mn) Series'

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'

'var: Perthite'

Ferberite

'Fergusonite'

Ferrimolybdite

Ferristrunzite

Ferro-actinolite

Ferro-gedrite

Ferro-hornblende

'Ferronigerite'

Fillowite

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: Martite

var: Specularite

Hemimorphite

Hessite

Heterosite

'Heulandite'

Hidalgoite

Hisingerite

Hollandite

Honessite (TL)

'Hornblende'

Hübnerite

Hureaulite

Huttonite

Hydromagnesite

Hydrozincite

'Hypersthene'

'Iddingsite'

Ilmenite

var: Picroilmenite

Iron

var: Kamacite

Isocubanite

Ixiolite

Jamesonite

Jarosite

Kaolinite

Kemmlitzite

Kentbrooksite

Kettnerite

'K Feldspar'

'var: Adularia'

Kolbeckite

Krennerite

Kutnohorite

Kyanite

Laumontite

Låvenite

Lawrencite

Lazulite

Leadhillite

Lechatelierite

Lepidocrocite

'Lepidolite'

Leucophosphite

Leucoxene

Liandratite

'Limonite'

Lithiophilite

Löllingite

Mackinawite

Magnesio-foitite

Magnesite

Magnetite

var: Titaniferous Magnetite

Malachite

'Manganese Oxides'

'var: Manganese Dendrites'

Manganite

Marcasite

'Maskelynite'

Melanterite

Merrillite

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)

Petzite

Phenakite

Phlogopite

Phosphosiderite

Pigeonite

Platinum

'Plessite'

Plumbogummite

Pollucite

Polybasite

Polycrase-(Y)

Prehnite

Prosopite

Pseudobrookite

Pseudomalachite

Pseudorutile

'Psilomelane'

'Pumpellyite'

Purpurite

Pyrargyrite

Pyrite

var: Bravoite

'Pyrochlore'

Pyrochlore Group (TL)

var: Bariopyrochlore (of Hogarth 1977)

var: Ceriopyrochlore (of Hogarth 1977) (FRL)

var: Plumbopyrochlore (of Skorobogatova et al.)

Pyrolusite

Pyromorphite

Pyrope

Pyrophyllite

'Pyroxene Group'

Pyrrhotite

Quartz

var: Agate

var: Aventurine

var: Chalcedony

var: Lake Superior Agate

var: Rose Quartz

var: Smoky Quartz

Reidite

'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 Subgroup'

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

Tetrataenite

Thalénite-(Y)

Thomsonite-Ca

Thorite

'Thorogummite'

Titanite

Topaz

'Tourmaline'

'var: Rubellite'

Tremolite

Tridymite

Triphylite

Troilite

Uraninite

Uranophane

'Uranpyrochlore (of Hogarth 1977)'

'Uvite'

Variscite

Varulite

Väyrynenite

Vesuvianite

Violarite

Vivianite

'Wad'

Wavellite

Waylandite

Wodginite

Wöhlerite

Wollastonite

Wurtzite

Xenotime-(Y)

Zaratite

'Zinnwaldite'

Zircon

Zoisite

var: Thulite


318 valid minerals. 2 (TL) - type locality of valid minerals. 1 (FRL) - first recorded locality of unapproved mineral/variety/etc.

Rock Types Recorded

Entries shown in red are rocks recorded for this region.

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities


Localities in this Region


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://wgnhs.uwex.edu/wisconsin-geology/minerals-wisconsin/

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/

Some notes on Wisconsin fluorescent minerals http://www.mindat.org/article.php/2200/Some+notes+on+Wisconsin+Fluorescent+Minerals

Mining Artifacts site - many historic photos of Wisconsin mines: http://www.miningartifacts.org/Wisconsin-Mines.html

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